Save warning can't be actioned because no clue is supplied about with the problem actually is

[SomeoneElseOSM]

URL

https://www.openstreetmap.org/edit?editor=id&way=165818201#map=20/53.99930/-1.49921

How to reproduce the issue?

Edit object
Correct operator
Observe message
By unable to act on message because it does not say what is wrong.

Screenshot(s) or anything else?

Which deployed environments do you see the issue in?

Released version at openstreetmap.org/edit

What version numbers does this issue effect?

2.29.0

Which browsers are you seeing this problem on?

Firefox

[SomeoneElseOSM]

The problem may be related to an "operator" / "operator:wikidata" mismatch - removing the latter did resolve the error.

I've no idea whether Craft Union (which is a pub company under the Stonegate umbrella) has its own wikidata entry or not, but whether a pub is a "Craft Union" pub rather than another Stonegate offering will give users a steer as to what to expect there (like many pub companies, Stonegate target different groups of sites at different markets. Sometimes (as here) these are distinguished by a separate operator name, sometimes not.