https://gist.github.com/FunniMCEnthusiast/d291383551cce16c0ac0288d55841b25

Seems to come from this particular error
FabInjector failed to find injection point for net/minecraft/class_634;method_11117(Lnet/minecraft/class_2724;)V Lnet/minecraft/client/gui/screen/DownloadingTerrainScreen;()V
located in com.unascribed.fabrication.mixin.a_fixes.declared_travel.MixinClientPlayNetworkHandler

I'll have to test if this also occurs by itself on the Forge edition