[Feature Request] Remember series collection-tags when all episodes are deleted

I’ve organised my series in collections with the use of tags. I did this on the top-level for series.
I delete episodes after watching, and when the last available episode of a series gets deleted, the tags go as well: when a new episode is added to the server the collection-tags are missing.

Can Plex remember my modifications to the tags even if there are no episoded available for some time?

I delete episodes from within Plex, so the series-folder on my pc is never deleted, only individual episodes.

If there are no episodes left, there is no show anymore.
Leave at least one placeholder episode if you want Plex to remember any customizations.

A ‘special’ episode, even with a ‘fake’ file will do.