Zabe added a comment.

  I don't know if it's interesting, but I also saw this happen on notwikilambda 
when playing around with it a bit.
  
    [614fa6e8509a8e1eda33cd92] 
/w/index.php?title=ZObject:Z10019&curid=986&diff=2297&oldid=2264 
Wikimedia\Assert\ParameterTypeException: Bad value for parameter $oldContent: 
must be a TextContent|null
    
    Backtrace:
    
    from 
/data/project/notwikilambda/public_html/w/vendor/wikimedia/assert/src/Assert.php(105)
    #0 
/data/project/notwikilambda/public_html/w/includes/diff/SlotDiffRenderer.php(89):
 Wikimedia\Assert\Assert::parameterType(array, 
MediaWiki\Extension\WikiLambda\ZObjectContent, string)
    #1 
/data/project/notwikilambda/public_html/w/includes/diff/TextSlotDiffRenderer.php(125):
 
SlotDiffRenderer->normalizeContents(MediaWiki\Extension\WikiLambda\ZObjectContent,
 MediaWiki\Extension\WikiLambda\ZObjectContent, string)
    #2 
/data/project/notwikilambda/public_html/w/includes/diff/DifferenceEngine.php(1216):
 TextSlotDiffRenderer->getDiff(MediaWiki\Extension\WikiLambda\ZObjectContent, 
MediaWiki\Extension\WikiLambda\ZObjectContent)
    #3 
/data/project/notwikilambda/public_html/w/includes/diff/DifferenceEngine.php(1124):
 DifferenceEngine->getDiffBody()
    #4 
/data/project/notwikilambda/public_html/w/includes/diff/DifferenceEngine.php(1086):
 DifferenceEngine->getDiff(string, string, string)
    #5 
/data/project/notwikilambda/public_html/w/includes/diff/DifferenceEngine.php(852):
 DifferenceEngine->showDiff(string, string, string)
    #6 
/data/project/notwikilambda/public_html/w/includes/page/Article.php(930): 
DifferenceEngine->showDiffPage(boolean)
    #7 
/data/project/notwikilambda/public_html/w/includes/page/Article.php(511): 
Article->showDiffPage()
    #8 
/data/project/notwikilambda/public_html/w/includes/actions/ViewAction.php(74): 
Article->view()
    #9 /data/project/notwikilambda/public_html/w/includes/MediaWiki.php(538): 
ViewAction->show()
    #10 /data/project/notwikilambda/public_html/w/includes/MediaWiki.php(320): 
MediaWiki->performAction(Article, Title)
    #11 /data/project/notwikilambda/public_html/w/includes/MediaWiki.php(925): 
MediaWiki->performRequest()
    #12 /data/project/notwikilambda/public_html/w/includes/MediaWiki.php(559): 
MediaWiki->main()
    #13 /data/project/notwikilambda/public_html/w/index.php(53): 
MediaWiki->run()
    #14 /data/project/notwikilambda/public_html/w/index.php(46): wfIndexMain()
    #15 {main}

TASK DETAIL
  https://phabricator.wikimedia.org/T231084

EMAIL PREFERENCES
  https://phabricator.wikimedia.org/settings/panel/emailpreferences/

To: Zabe
Cc: Zabe, marcella, LClightcat, Sunny00217, AnYiLin, dancy, Xiplus, thcipriani, 
Krinkle, WMDE-leszek, Ladsgroup, Addshore, Tgr, Michael, 
Lucas_Werkmeister_WMDE, Aklapper, Invadibot, maantietaja, Akuckartz, 
darthmon_wmde, Nandana, NebulousIris, Amorymeltzer, Lahi, Gq86, 
GoranSMilovanovic, QZanden, LawExplorer, _jensen, rosalieper, Liudvikas, 
Scott_WUaS, Verdy_p, Wikidata-bugs, WMDE-Fisch, aude, Gryllida, 
Jdforrester-WMF, Mbch331, Jay8g
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