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Page summary may not be purged/regenerated after revert
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Description

There are a couple of recent reports of summaries generated from vandalized wiki pages remaining visible for hours after the vandalizing edit was reverted.

https://www.mediawiki.org/wiki/Topic:V0vpwesmmqofrl6w
https://it.wikipedia.org/wiki/Wikipedia:Officina#Anteprima_popup_anonimi

It appears that the appropriate ChangeProp purge event is not being emitted in at least some cases. (Could this be related to the revert method used?)