Can it cause any problems for users who will eventually upgrade?

One could argue that the home directory is not meant to be readable by anyone and that if that is the case, that's a bug on its own and then the issue here does not need fixing.
One could argue that no file in the home directory should ever be this widely accessible.
One could argue that I will not be the last one running into this wondering why the file has that loose permissions.
This pull request ignores argument (1) and improves on (2) and (3).
I don't expect any breakage and will be curious to learn about detail if I end up being wrong about it.
What do you think?

There should not be an issue for the native app. My only concern is whether the flatpak/nixpkg may stop working, but I will give this a try with flatpak.

Seems to work fine in flatpak