With the MCR Revision overhaul getRevisionText no longer does anything with the $wiki parameter.
With all of our code on Gerrit this is only called with a $wiki param in:
- core/tests/phpunit/includes/RevisionTest.php RevisionTest::testGetRevisionText (but this test doesn't have a test case with $wiki)
- extensions/Wikibase/lib/includes/Store/Sql/WikiPageEntityRevisionLookup.php WikiPageEntityRevisionLookup::loadEntityBlob (the method causing both T183631 and T183583)
Previous behaviour should be restored.