Inkstitch v3.0.1 just released
Inkstitch v3.0.1 is now available at inkstitch.org. As far as I can tell this version has fixed all of the issues I had with v3.0.0.
Troubleshooting Inkstitch v3.0.0 on Linux
The TLDR is: https://github.com/inkstitch/inkstitch/releases/tag/dev-build-kall-try-and-error