Issue:

Version 1.4.0 and 1.3.5 crashes on startup with the Mixin Bootstrap mod installed.
Removing Mixin Bootstrap or adding Mixin 0.7-0.8 Compatibility didn't help.

Logs: latest.log

• Using Forge 14.23.5.2860

Maybe, reverting the compatibility for Mixin 0.7.0 introduced 1.3.5 could fix this?

Remove Item Physics; it will almost certainly conflict with the item floating logic included in 1.4.0. Not sure what the issue is with 1.3.5 though.

Ahah, yes, that was it! Thank you, the new update is gorgeous!
Could be a config option to disable the floating logic added, though?

A config option on its own doesn't help as the mixin gets applied in all cases. What I can do (and have done in 1.5.0) is make it optional so Item Physics will override it. You should be able to add that mod back now.

Thank you, this is great!