I really don't know what else there is to say. It doesn't appear to segfault, or otherwise obviously crash (no mention of segmentation fault in dmesg). The process just quits, and doesn't save any changes if I'm editing a profile (also quits in other situations, but this is the worst one)

Console output when running from terminal:

https://launchermeta.mojang.com/v1/products/launcher/6f083b80d5e6fabbc4236f81d0d8f8a350c665a9/linux.json
[0807/104253.312617:INFO:main_context.cpp(136)] CEF initialized successfully.
[0807/104253.312753:INFO:main_context.cpp(138)] CEF version: 86.0.23+ga2c2edf+chromium-86.0.4240.193
[0807/104253.341487:ERROR:sandbox_linux.cc(374)] InitializeSandbox() called with multiple threads in process gpu-process.
sh: line 1: orca: command not found
Created browser window for reuse: 0x7400001

Also attached output with strace.

Update: I found out that it's a subprocess that crashes, so I attached strace to that process - it seems to be killed by SIGALRM. Attached the output.

Normally I would revert to an older version but I literally can't anymore due to forced auto-update.