This is somewhat tricky to test locally since you really need multiple webservers to test it properly, but I:
- Created some setup issues, saw banner.
- Ignored/cleared them, saw banner go away.
- Verified database cache writes were occurring properly.
Then I sort of faked it like this:
- Created a setup issue.
- Manually set the database cache value to `[]` ("no issues").
- Reloaded page.
- No more banner.