My recipes are creating a parsing error. For example:

• 19:21:07.311   game   [19:21:07] [Render thread/ERROR] [minecraft/RecipeManager]: Parsing error loading recipe buildhelper:arrowwand_item
• 19:21:07.311   game   com.google.gson.JsonSyntaxException: Unknown item 'buildhelper:arrowwand_item'

I have just updated my mod from 1.18.2 to 1.19.2. Thus the asset files are still as they had been used in 1.18.2. My 

my recipe file with path/file name: resources/data/buildhelper/recipes/arrowwand_item.json

has this content:

{
  "type": "crafting_shaped",
  "pattern": [
    "  B",
    " - ",
    "D  "
  ],
  "key": {
    "B":{
      "item": "minecraft:bow"
	},
    "-":{
		"tag": "forge:rods/wooden"
	},
    "D": {
      "item": "minecraft:diamond"
    }
  },
  "result": {
    "item": "buildhelper:arrowwand_item"
  }
}

the item is registered like this:

    @Mod.EventBusSubscriber(bus=Mod.EventBusSubscriber.Bus.MOD)
    public static class RegistryEvents
    {
        
        @SubscribeEvent
        public void register(RegisterEvent registerEvent) 
        {            
            registerEvent.register(ForgeRegistries.Keys.ITEMS, 
                    helper -> {
                        helper.register(new ResourceLocation(MODID, ItemArrowWand.NAME), new ItemArrowWand(new Item.Properties().stacksTo(1).tab(CreativeModeTab.TAB_TOOLS)));
                        
                        // -- snip -- more lines for all the other wands registred the same way
                    }
            );        
    		LOGGER.info("Torojima's Buildhelper Items registered.");
    	}        
    }

MODID is 

    public static final String MODID = "buildhelper";

in the mod main class, and the registered name is

	public static final String NAME = "arrowwand_item";

from the item class ...

I have a number of items with similar recipe files and registries ... all with the same error.

I'm at a loss where the mismatch is happening

You don't have a modid specified on your EventBusSubscriber annotation.

https://github.com/MinecraftForge/MinecraftForge/blob/0e66b7b21757e510aef706ca320881b9eb268822/javafmllanguage/src/main/java/net/minecraftforge/fml/common/Mod.java#L57

Your log statement is in the wrong place to test if you are actually registering anything. It should be inside the lambda.

my main mod class starts like this:

 

@Mod(BuildHelperMod.MODID)
public class BuildHelperMod
{
  ....

that should register the modid correctly, or not? The static MODID in the main class is only for using the name everywhere with only one position to define the string.