Vgutierrez added a comment.
so it looks like the apache fix doesn't fix every scenario. This small PoC triggers the issue: <?php http_response_code(304); echo("test"); flush(); TASK DETAIL https://phabricator.wikimedia.org/T237319 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: Vgutierrez Cc: Addshore, WMDE-leszek, Ladsgroup, CDanis, Joe, Vgutierrez, ema, Nikerabbit, DannyS712, Aklapper, darthmon_wmde, Legado_Shulgin, Nandana, Davinaclare77, Qtn1293, Techguru.pc, Lahi, Gq86, GoranSMilovanovic, Th3d3v1ls, Hfbn0, QZanden, LawExplorer, Zppix, _jensen, rosalieper, Scott_WUaS, Jonas, Wong128hk, Wikidata-bugs, aude, Lydia_Pintscher, faidon, Mbch331, Rxy, Jay8g, fgiunchedi
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