Since the changes made in 0.3.3 sponge servers now crash during start up. here is the latest log https://pastebin.com/dW5Y1bGG

Doesn't happen on forge servers, so is a recent incompatibility with sponge.

also wanted to say thanks for fixing all the other issues i mentioned, and ones other people mentioned, have been testing a bit today in singleplayer and forge server (cause sponge doesn't work) and all is looking great. the transition beween unsupported world like atum blew my mind. awesome work