So I am trying to mix in some code into another game but it just ignores my mixins.json.

{
  "required": true,
  "package": "io.github.tkfrvisionofficial.allpalmsarebeautiful.mixin",
  "compatibilityLevel": "JAVA_8",
  "refmap": "allpalmsarebeautiful.refmap.json",
  "mixins": [
    "PalmTree1Mixin",
    "PalmTree2Mixin",
    "PalmTree3Mixin",
    "PalmTree4Mixin"
  ],
  "client": [
  ],
  "injectors": {
    "defaultRequire": 1
  },
  "minVersion": "0.8"
}

buildscript {
    repositories {
        maven { url = 'https://maven.minecraftforge.net' }
        maven { url = 'https://repo.spongepowered.org/repository/maven-public/' }
        mavenCentral()
     }
    dependencies {
        classpath group: 'net.minecraftforge.gradle', name: 'ForgeGradle', version: '5.1.+', changing: true
        classpath group: 'org.spongepowered', name: 'mixingradle', version: '0.7.32'
    }
}

apply plugin: 'net.minecraftforge.gradle'
apply plugin: 'org.spongepowered.mixin'
// Only edit below this line, the above code adds and enables the necessary things for Forge to be setup.
apply plugin: 'eclipse'
apply plugin: 'maven-publish'

repositories {
    maven {
        url 'https://www.cursemaven.com'
        content {
                 includeGroup "curse.maven"
        }
    }
    mavenLocal()
}

version = '1.0'
group = 'com.yourname.modid' // http://maven.apache.org/guides/mini/guide-naming-conventions.html
archivesBaseName = 'modid'

java.toolchain.languageVersion = JavaLanguageVersion.of(8) // Mojang ships Java 8 to end users, so your mod should target Java 8.

println('Java: ' + System.getProperty('java.version') + ' JVM: ' + System.getProperty('java.vm.version') + '(' + System.getProperty('java.vendor') + ') Arch: ' + System.getProperty('os.arch'))
minecraft {
    // The mappings can be changed at any time, and must be in the following format.
    // Channel:   Version:
    // snapshot   YYYYMMDD   Snapshot are built nightly.
    // stable     #          Stables are built at the discretion of the MCP team.
    // official   MCVersion  Official field/method names from Mojang mapping files
    //
    // You must be aware of the Mojang license when using the 'official' mappings.
    // See more information here: https://github.com/MinecraftForge/MCPConfig/blob/master/Mojang.md
    //
    // Use non-default mappings at your own risk. they may not always work.
    // Simply re-run your setup task after changing the mappings to update your workspace.

    mappings channel: 'official', version: '1.16.5'
    // mappings channel: 'snapshot', version: '20210309-1.16.5'

    // makeObfSourceJar = false // an Srg named sources jar is made by default. uncomment this to disable.
    
    // accessTransformer = file('src/main/resources/META-INF/accesstransformer.cfg')

    // Default run configurations.
    // These can be tweaked, removed, or duplicated as needed.
    runs {
        client {
            workingDirectory project.file('run')

            // Recommended logging data for a userdev environment
            // The markers can be changed as needed.
            // "SCAN": For mods scan.
            // "REGISTRIES": For firing of registry events.
            // "REGISTRYDUMP": For getting the contents of all registries.
            property 'forge.logging.markers', 'REGISTRIES'

            // Recommended logging level for the console
            // You can set various levels here.
            // Please read: https://stackoverflow.com/questions/2031163/when-to-use-the-different-log-levels
            property 'forge.logging.console.level', 'debug'

            // https://github.com/SpongePowered/Mixin/issues/462#issuecomment-791370319
            property 'mixin.env.remapRefMap', 'true'
            property 'mixin.env.refMapRemappingFile', "${projectDir}/build/createSrgToMcp/output.srg"

            arg "-mixin.config=allpalmsarebeautiful.mixins.json"

            mods {
                examplemod {
                    source sourceSets.main
                }
            }
        }

        server {
            workingDirectory project.file('run')

            // Recommended logging data for a userdev environment
            // The markers can be changed as needed.
            // "SCAN": For mods scan.
            // "REGISTRIES": For firing of registry events.
            // "REGISTRYDUMP": For getting the contents of all registries.
            property 'forge.logging.markers', 'REGISTRIES'

            // Recommended logging level for the console
            // You can set various levels here.
            // Please read: https://stackoverflow.com/questions/2031163/when-to-use-the-different-log-levels
            property 'forge.logging.console.level', 'debug'

            arg "-mixin.config=allpalmsarebeautiful.mixins.json"

            mods {
                examplemod {
                    source sourceSets.main
                }
            }
        }

        data {
            workingDirectory project.file('run')

            // Recommended logging data for a userdev environment
            // The markers can be changed as needed.
            // "SCAN": For mods scan.
            // "REGISTRIES": For firing of registry events.
            // "REGISTRYDUMP": For getting the contents of all registries.
            property 'forge.logging.markers', 'REGISTRIES'

            // Recommended logging level for the console
            // You can set various levels here.
            // Please read: https://stackoverflow.com/questions/2031163/when-to-use-the-different-log-levels
            property 'forge.logging.console.level', 'debug'

            // Specify the modid for data generation, where to output the resulting resource, and where to look for existing resources.
            args '--mod', 'examplemod', '--all', '--output', file('src/generated/resources/'), '--existing', file('src/main/resources/')

            mods {
                examplemod {
                    source sourceSets.main
                }
            }
        }
    }
}

// Include resources generated by data generators.
sourceSets.main.resources { srcDir 'src/generated/resources' }

dependencies {
    annotationProcessor 'org.spongepowered:mixin:0.8.5:processor'

    // Specify the version of Minecraft to use, If this is any group other then 'net.minecraft' it is assumed
    // that the dep is a ForgeGradle 'patcher' dependency. And it's patches will be applied.
    // The userdev artifact is a special name and will get all sorts of transformations applied to it.
    minecraft 'net.minecraftforge:forge:1.16.5-36.2.34'

    // You may put jars on which you depend on in ./libs or you may define them like so..
    // compile "some.group:artifact:version:classifier"
    // compile "some.group:artifact:version"

    // Real examples
    // compile 'com.mod-buildcraft:buildcraft:6.0.8:dev'  // adds buildcraft to the dev env
    // compile 'com.googlecode.efficient-java-matrix-library:ejml:0.24' // adds ejml to the dev env

    // The 'provided' configuration is for optional dependencies that exist at compile-time but might not at runtime.
    // provided 'com.mod-buildcraft:buildcraft:6.0.8:dev'

    // These dependencies get remapped to your current MCP mappings
    // deobf 'com.mod-buildcraft:buildcraft:6.0.8:dev'

    implementation fg.deobf('curse.maven:tropicraft-254794:3606854')
    implementation fg.deobf('curse.maven:oh-the-biomes-youll-go-247560:3485079')
    implementation fg.deobf('curse.maven:the-one-probe-245211:3752096')

    // For more info...
    // http://www.gradle.org/docs/current/userguide/artifact_dependencies_tutorial.html
    // http://www.gradle.org/docs/current/userguide/dependency_management.html

}

// Example for how to get properties into the manifest for reading by the runtime..
jar {
    manifest {
        attributes([
            "Specification-Title": "examplemod",
            "Specification-Vendor": "examplemodsareus",
            "Specification-Version": "1", // We are version 1 of ourselves
            "Implementation-Title": project.name,
            "Implementation-Version": "${version}",
            "Implementation-Vendor" :"examplemodsareus",
            "Implementation-Timestamp": new Date().format("yyyy-MM-dd'T'HH:mm:ssZ"),
            "MixinConfigs": "allpalmsarebeautiful.mixins.json"
        ])
    }
}

mixin {
    add sourceSets.main, "allpalmsarebeautiful.refmap.json"

    // config "allpalmsarebeautiful.mixins.json"
}

// Example configuration to allow publishing using the maven-publish task
// This is the preferred method to reobfuscate your jar file
jar.finalizedBy('reobfJar')
// However if you are in a multi-project build, dev time needs unobfed jar files, so you can delay the obfuscation until publishing by doing
//publish.dependsOn('reobfJar')

publishing {
    publications {
        mavenJava(MavenPublication) {
            artifact jar
        }
    }
    repositories {
        maven {
            url "file:///${project.projectDir}/mcmodsrepo"
        }
    }
}

For Reference I am on 1.16.5 but you should be able to read all the nitty gritty from build.gradle file

Aight then im gonna flash you 😂

package io.github.tkfrvisionofficial.allpalmsarebeautiful.mixin;

import corgiaoc.byg.common.world.feature.config.BYGTreeConfig;
import corgiaoc.byg.common.world.feature.overworld.trees.palm.PalmTree1;
import net.minecraft.util.math.BlockPos;
import net.minecraft.util.math.MutableBoundingBox;
import net.minecraft.world.ISeedReader;
import net.tropicraft.core.common.dimension.feature.tree.PalmTreeFeature;
import org.spongepowered.asm.mixin.Mixin;
import org.spongepowered.asm.mixin.injection.At;
import org.spongepowered.asm.mixin.injection.Inject;
import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;

import java.util.Random;
import java.util.Set;

@Mixin(PalmTree1.class)
public class PalmTree1Mixin {

    @Inject(at = @At("RETURN"), method = "generate", remap = false)
    private void generate(Set<BlockPos> changedBlocks, ISeedReader worldIn, Random rand, BlockPos pos, MutableBoundingBox boundsIn, boolean isSapling, BYGTreeConfig config, CallbackInfoReturnable<Boolean> cir) {
        System.out.println("plswork1");
        if (cir.getReturnValue()) {
            PalmTreeFeature.spawnCoconuts(worldIn, pos, rand, 0, null);
            System.out.println("cocunut1");
        }
    }

}