Crash with Effortless for fabric that only occurs with QFAPI. Using qfapi-7.5.0_qsl-6.1.2_fapi-0.91.0_mc-1.20.1and effortless-1.20.1-2.2.0
crash-2024-03-16_19.47.50-client.txt

I've never seen this type of crash before. Could you please upload the log as well?

Running just QFAPI and Effortless I reproduced the crash for clarity.
latest.log
crash-2024-03-16_22.12.11-client.txt

Looks like effortless explicitly checks for fabric to exist. Not much quilt can do here. I would bring it up with the mod. Hopefully they can easily add quilt support.

It looks like it already has: huskcasaca/effortless#78