Using the stacktrace remapper on any version for Mojang mappings seems to just crash the browser tab after a few seconds of not showing any update. Example input for 24w21a:
java.lang.IllegalStateException: Failed to load registries due to above errors
at akl.a(SourceFile:181)
at akl.a(SourceFile:155)
at fzm$a.a(SourceFile:49)
at fzm.a(SourceFile:59)
at fyx.a(SourceFile:117)
at fyx.a(SourceFile:109)
at fyx.a(SourceFile:117)
at abc.a(SourceFile:22)
at abc.a(SourceFile:8)
at zi.a(SourceFile:27)
at bpg.d(SourceFile:162)
at bpk.d(SourceFile:23)
at bpg.B(SourceFile:136)
at bpg.bB(SourceFile:121)
at fgi.c(SourceFile:1240)
at fgi.f(SourceFile:882)
Using the stacktrace remapper on any version for Mojang mappings seems to just crash the browser tab after a few seconds of not showing any update. Example input for 24w21a: