See https://en.wikipedia.org/w/index.php?title=User_talk:MusikAnimal&oldid=952194241#Imports_of_templates/modules and https://en.wikipedia.org/wiki/Special:PermanentLink/951242782#Using_steward_access? - if revisions are exported from the current wiki, and then an attempt to import them back to the current wiki is made, Special:Import should show a warning and ask for confirmation. Ideally this would apply even in the case of edits being exported from the current wiki, imported to a different wiki, exported from that wiki, and imported back to the current wiki, though I have no idea if the information required to detect that case is included with exported revisions currently.