As evidenced in SidebarHookHandlerTest, wikibase uses ::setExtensionData for the wikibase-otherprojects-sidebar data. This should probably use ::appendExtensionData instead, to avoid destructive updates (see parent task for rationale).
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As far as I see, it’s executed at most once per parse (assuming that ContentAlterParserOutput is called at most once), so it should be safe to continue using ParserOutput::setExtensionData. (It sets an array, but in one pass. And the order matters, which is not guaranteed if the set behavior of ParserOutput::appendExtensionData is taken seriously.)
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@cscott: Removing task assignee as this open task has been assigned for more than two years - see the email sent to all task assignees on 2024-04-15.
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