I currently have the following spawn predicate set up for my mob:

public static boolean checkMyMobSpawnRules(EntityType<? extends MyMob> entityType, ServerLevelAccessor serverLevelAccessor, MobSpawnType mobSpawnType, BlockPos blockPos, Random random) {

        boolean notUndergroundOrIndoors = true;
        for (int y = blockPos.getY() + 1; y < 320; ++y) {
                BlockState blockState = serverLevelAccessor.getBlockState(new BlockPos(blockPos.getX(), y, blockPos.getZ()));
                Block block = blockState.getBlock();
                if (!(block instanceof AirBlock || block instanceof LeavesBlock)) {
                    notUndergroundOrIndoors = false;
                    break;
                }
        }

        return Monster.checkAnyLightMonsterSpawnRules(entityType, serverLevelAccessor, mobSpawnType, blockPos, random) && notUndergroundOrIndoors && Utils.nearbyChunkHasCrop(serverLevelAccessor, blockPos);
    }

I have the following subscriber for a BiomeLoadingEvent:

    @SubscribeEvent(priority = EventPriority.HIGHEST)
    public static void biomeLoading(BiomeLoadingEvent event) {
        Biome.BiomeCategory category = event.getCategory();

        if (category != Biome.BiomeCategory.NETHER && category != Biome.BiomeCategory.THEEND) {
            event.getSpawns().addSpawn(MobCategory.MONSTER, new MobSpawnSettings.SpawnerData(ModEntities.MY_MOB.get(), 100, 1, 1));
        }
    }

I also subscribe to FMLCommonSetupEvent:

    @SubscribeEvent
    public static void commonSetup(FMLCommonSetupEvent event) {
        event.enqueueWork(() -> SpawnPlacements.register(ModEntities.STALIN.get(), SpawnPlacements.Type.ON_GROUND, Heightmap.Types.WORLD_SURFACE, Stalin::checkStalinSpawnRules));
    }

My logic seems to be working with 1 exception: my mob only spawns at night. I thought using Monster.checkAnyLightMonsterSpawnRules would allow my mob to spawn day or night. Is there a way to get my mob to spawn at any time of day?

My subclasses Monster if that's relevant.

I figured it out. Having my mob entity inherit from PathfinderMob instead of Monster did the trick.