Steps to reproduce:
Post > New Work
Fill in required information
Check "Add co-creators?"
Fill in the newly-revealed field with another user's name, e.g. testy4
Check "This work is part of a series"
Fill in "Or create and use a new one" with a name for your series, e.g. Test Series
Press "Post Without Preview"
From the posted work, follow one of the links to your series
Choose "Remove Me As Author" on the series page
Choose "OK" on the confirmation pop-up
The page reloads with the blue flash message, "You have been removed as an author from the series and its works."
The buttons for editing/managing the series are gone.
My name is removed from the work blurb.
The word "Creators" in the series meta is now "Creator."
However, it still lists two creators after "Creator."
So I am indeed removed from actually being a creator, but my name still appears in the byline.
What should happen instead
My name should be removed from the actual list of series creators. (In other words, it should now say, "Creator: testy4" in the meta.)
This is the same byline caching that causes some of the issues under the epic "Changes to pseud or username do not update all user creations."