Version 0.10.0a has a few errors showing up in the log.

[22:32:32] [Render thread/ERROR] [minecraft/RecipeManager]: Parsing error loading recipe supplementaries:checkerboard_recipe
com.google.gson.JsonSyntaxException: Unknown item 'supplementaries:checkerboard_block'
[22:32:32] [Render thread/ERROR] [minecraft/RecipeManager]: Parsing error loading recipe supplementaries:pancake_recipe1
com.google.gson.JsonSyntaxException: Unknown item tag 'forge:egg'
[22:32:32] [Render thread/ERROR] [minecraft/LootTableManager]: Couldn't parse loot table supplementaries:blocks/checkerboard_block
com.google.gson.JsonSyntaxException: Expected name to be an item, was unknown string 'supplementaries:checkerboard_block'

While the pancake recipe works fine, the checker block has no recipe. The game loads fine.

I noticed that after I released it. It's not a big problem at all but it happened because I had that block called checkerboard block instead of checker block. I already fixed it and It will come with next update. That pancake recipe is actually fine because many mode add those tags. I will add those too though, so it won't complain