Hi,
If Joplin was installed using the .AppImage, see No more launching appImage applications at startup after update 24.04 - #2 by personalizedrefriger for workarounds and related discussion.
Linux Mint 22 should be based on Ubuntu 24.04 (according to its release notes). As such, the information specific to Ubuntu 24.04 included in the discussion may also apply to Linux Mint 22.