ArthurTaylor added a comment.
I did some more digging today. Per the comments from Isabelle in this slack thread <https://wikimedia-crew.slack.com/archives/C01R06P8D1B/p1704805593675949>, when Parsoid processes Wikitext, it spins up an isolated sub-parse with its own ParserOutput. Specifically for Templates, it has a `TemplateHandler` that spawns a wikitext preprocessor <https://gerrit.wikimedia.org/g/mediawiki/services/parsoid/+/178fe89fb26fffc2784fcbf3865d094ef32a2bab/src/Wikitext/Wikitext.php> when it encounters a template tag <https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/services/parsoid/+/178fe89fb26fffc2784fcbf3865d094ef32a2bab/src/Wt2Html/TT/TemplateHandler.php#1053>. The preprocessor runs the Lua correctly, and the usages are always registered in the `ExtensionData` of the parserOutput object present in the context of the Lua parse. But this parserOutput object is not the object that is eventually passed up to the output of the ParsoidCachePrewarmJob. There is code to collect the usages <https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/core/+/5d3a549326018ebdca1bb35d6d43608f86c73d8b/includes/parser/Parsoid/Config/DataAccess.php#398> from the internal parse, which often / mostly works. The `collectMetadata` function transfers the `ExtensionData` to the active parserOutput object. What I suspect is happening is that for some recursive templates, whatever is doing the recursion is at some point just replacing the template text with the rendered text and throwing away the parserOutput. Specifically we know that in this template <https://eo.wikipedia.org/w/index.php?title=%C5%9Cablono:Informkesto_rolulo&action=edit> the addition of P509 <https://phabricator.wikimedia.org/P509> in the lua code: {{Informkesto/Opcia linio2 |priskribo=Mortokialo|teksto={{#invoke:Wikidata|claim|P509|parameter=link|list=, }} }} does not get propagated up. I will have a look again tomorrow to see if I can spot why. TASK DETAIL https://phabricator.wikimedia.org/T255706 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: ArthurTaylor Cc: ArthurTaylor, hoo, Lucas_Werkmeister_WMDE, ItamarWMDE, Ladsgroup, Krinkle, eprodromou, aaron, Michael, Aklapper, thcipriani, Danny_Benjafield_WMDE, Isabelladantes1983, Themindcoder, Adamm71, Jersione, Hellket777, LisafBia6531, Astuthiodit_1, 786, Biggs657, karapayneWMDE, Invadibot, maantietaja, Juan90264, Alter-paule, Beast1978, Un1tY, Akuckartz, Hook696, darthmon_wmde, Rosalie_WMDE, Kent7301, joker88john, CucyNoiD, Nandana, Gaboe420, Giuliamocci, Cpaulf30, Lahi, Gq86, Af420, Bsandipan, GoranSMilovanovic, QZanden, KimKelting, LawExplorer, Lewizho99, Maathavan, _jensen, rosalieper, Neuronton, Scott_WUaS, Verdy_p, Wikidata-bugs, aude, Jdforrester-WMF, Mbch331, Jay8g
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