Topics failing validation after migration throw '422' error instead of "nice" message

[codinghorror (Jeff Atwood)]

@jomaxro

If I modified the title and changed the category I received a 422 error, but this is not consistent with what I first saw.

So as suspected this has to do with category only edits triggering validation on the title. So only the topic owner, staff, or TL3 could really run into this.