Seems other mods have problem with chat sign
Crash report - https://mclo.gs/PHlqwo6
Latest log - https://mclo.gs/OqGJON1

Hm... Chat Signing Hider seems to work.
ShutUpMojang on the other hand looks incompatible in multiple ways. You can just remove that mod since Chat Signing Hider already removes the "Messages cannot be verified on this server" anyways.
(Or you should probably use No Chat Reports instead.)

The Mixin error I got with ShutUpMojang is different to your log, so it might be yet another conflicting mod, but it's not clear which one.

If it still crashes, you can try disabling a hand full of mods and see if it stops crashing.
If so, we know that the conflicting mod was one of the ones you last disabled.

edit:
I walked through a bunch of potential conflicts, though none of them crashed (on title screen or single player):
Chat Tools is fine.
Compact Chat is definitely fine.
EssentialClient is fine.
Reply Mod is fine.
Restore Chat Links is fine.
Suggestion Tweaker is fine.
Very Many Players is fine.

seems incompatible was in chat signing hider. Thank for help

Ah, I think this is probably not the last we're gonna see of this crash.

It's not actually a conflict with Chat Signing Hider but it's a mixin ordering issue with another mod.
Removing Chat Signing Hider randomly changed the mixin order, allowing Chat Heads to run first, which circumvented (solved) the issue.

I'm still not sure which mod is the true cause (apart from ShutUpMojang).

But oh well, if it works, it works.

Let me know if you run into this again, maybe I'll be able to find the true cause next time.

it still crash even without chat signing hider and shut up mojang(
use 0.10.18 version

https://mclo.gs/HgfP2W3

same error

I installed every mod that sounded suspicious and was finally able to reproduce the crash!
It's a conflict with EssentialClient.
I've reported the Mixin conflict, hopefully to be fixed soon.

tysm, i even cant imagine that was that mod, lol

Oh right, while I was looking at the mods I found that Disable Insecure Chat Toast is covered by what gatekeep does and I believe they can cause a crashing Mixin conflict too (@Redirect vs @Inject with the same target), so you should uninstall Disable Insecure Chat Toast.

Haha, I see you had issues with similar mods already jadeposting/gatekeep#3 😅

yes, i have problem with it when install 1.20...

The conflict with EssentialClient should now be fixed, so look out for the next release (probably 1.3.6) when it comes out.