Ok so the error is when you initiate a title edit on the first post, but you don’t actually change anything, and press save? Let me test that… editing soon…
aha yes I can repro this. Thanks for the report, indeed a bug of some kind @zogstrip . When you edit the topic title / category via the edit button next to the topic title, but don’t make any changes, and then press save, it is as @dirien describes.