Don't fail on partially updated Pane's view storage

[mattpap]

This is minimal change required to fix the issue. However, similar fix needs to be applied in general in other places and also improving the type of ViewStorage would help to identify possible locations. These changes aren't backportable, so they will have to wait for another PR.

fixes #14168

[mattpap]

This doesn't fail when run individually, only when multiple tests are run:

✗ Bug
 └┬─ in issue #14168
  └── doesn't allow to add multiple TileRenderer instances to a plot
timeout

[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.