actually, just delete this file and it will work:
/home/user/.minecraft/webcache2/Default/Preferences
Launcher
Linux 6.13.5-arch1-1 3.8.66
Friday, February 28, 2025 at 8:54:26 PM
Bootstrap
2.2.2
Monday, February 10, 2025 at 7:07:10 PM
UI
3.8.66
Friday, February 28, 2025 at 8:41:35 PM
It works ok if I delete /home/user/.minecraft/webcache2/ before launch
@alchemy you can edit the application launch properties to
Program: rm
Command-Line Arguments: ~/.minecraft/webcache2/Default/Preferences '|' minecraft-launcher