I would've created an issue on Connector however I've isolated this issue to just Forgified Fabric, apologies if the issue is meant to be in the other repository.

Issue:
Trying to use the Bioethanol bucket or view it in JEI appears to crash out the game.

Crash report: https://mclo.gs/LheJ1mN

Reproduction:
Using Forge 47.1.3 as per Connector's requirements, mod list is:

• ForgifiedFabricAPI 0.86.1+1.8.1+1.20.1
• Mekanism built from latest commit as of now: mekanism/Mekanism@9f13598

Give yourself a bioethanol bucket and try to place liquid.

Notes:
I've also tested just Mekanism on its own without any issues.