Steps to reproduce
Post a work
Edit the work
Check "This work is part of a series", and either pick an existing series or name a new one
Note that in the preview, the series is listed in the work meta, and under "Series this work belongs to".
Get redirected to your work index with a flash notice saying, "The work was not updated." However, if you go to the work, you will see it is in the series. The series is listed in the work meta, and under "Series this work belongs to".
What should happen
The work should not be added to the series.