I tried to import the full history of User:Grenavitar/Film from enwiki to testwiki. The import timed out halfway through, as the page has a huge number of revisions. The destination page (Template talk:Grenavitar/Film) exists, but when an attempt is made to delete it, MediaWiki claims that the page cannot be deleted because it does not exist.

A few issues here:

• A WMF shell user should delete the broken page from the testwiki DB.
• We should impose a timeout on import that is slightly shorter than the script execution timeout, to allow WikiImporter to clean up properly instead of leaving broken pages lying around. Filed as T121336: Better handling of timeouts during the import process.
• Why is MW claiming the page doesn't exist when it clearly does? Looks like there is more than one way to check for page existence...