net.minecraft.class_156 Render thread No data fixer registered for untitledduckmod:duck
net.minecraft.class_156 Render thread No data fixer registered for untitledduckmod:duck_egg
net.minecraft.class_156 Render thread No data fixer registered for untitledduckmod:goose
net.minecraft.class_156 Render thread No data fixer registered for untitledduckmod:goose_egg

These messages are no bugs and you shouldn't have to worry about it.

See this post for example: https://forums.minecraftforge.net/topic/94739-1163-getting-rid-of-data-fixer-error-spam/?do=findComment&comment=433558