today I updated all my mods (and replaced non updatable ones) to 1.20.4, and I found that MC crashed between showing a window and displaying the loading screen in that window. after some testing I narrowed down the last incompatibility to be between optifabric/fine and viafabricplus.
the logs are linked in order: just opti/fabric (working), opti/fabric/via (broken log), opti/fabric/via (broken crash report).
https://mclo.gs/fVRG1yR
https://mclo.gs/drNf1Rv
https://mclo.gs/Lb6WFma