"When importing revision with same timestamp as latest revision, treat it as the new latest." -- this is going to cause problems when trying to import large files and there is an error, so the file needs to be imported. That means if you already successfully imported 3000 records, and 3001 had the error, all the successful 3000 records will be imported. This should be an option.
Topic on Talk:MediaWiki 1.39
Hey there,
I'd recommend you submit this feature request to Phabricator; the relevant project is "MediaWiki-Core-Snapshots".