Persist space labels

I'm sometimes seeing labels in my spaces disappear, even though spaces themselves are still there (not sure about the root-cause yet, if it's about restarting the service, changing displays, ...).
Are there any ideas or tips on persisting space labels beyond service lifetime?

The issue names no files, tests, or entry points. Start by reproducing whether space labels disappear after restarting the service or changing displays, then trace the existing label lifecycle to determine where persistence is lost. Done means labels survive the reported service or display changes.

Written by the indexing model from the issue text.