I disagree that it should replace the page (this is behavior for all repos, not just InstantCommons setup). There are situations in which you want the remote content plus local content you might append.

It sounds like your specific instance is kind of annoying--imported image, then using InstantCommons, leading to dupe content--but I'm not quite sure how we'd detect the case.

(In reply to comment #1)

I disagree that it should replace the page (this is behavior for all repos, not
just InstantCommons setup). There are situations in which you want the remote
content plus local content you might append.

+1

+2.

I vaguely remember there being specific instances on Wikimedia projects where this behaviour is used.

(In reply to comment #3)

+2.

I vaguely remember there being specific instances on Wikimedia projects where
this behaviour is used.

EN does it, if they want to add certain templates (eg: This was a featured pic on X)

WONTFIXing this per Chad, Reedy and Bawolff.