I want to create a thunderbird profile on a different partition than my /home directory (specifically on a veracrypt encrypted volume, but the problem is not restricted to veracrypt). I have done this on other systems many times. It is not working on my new system.
When I try Choose Folder on the Create Profile Wizard, I am able to choose and create profile anywhere within my /home partition (eg /home/test). But if I choose a folder on another partition (or open veracrypt volume), the wizard instead substitutes a location within /run/user (eg /run/user/1000/doc/61cb947a/test).
I am using Thunderbird 128.2.3esr (64-bit) on Ubuntu 24.04 LTS, with a separate /home partition to /.
Why is Thunderbird refusing to accept the location I choose on other partitions, and how can I force it to?