Assume three content types: Book, Chapter, Page
If you want to add a Page to a Book, you visit book/{node}/add-page. This shows the node-add form for a Page, but tries to grab the available Chapters to reference from the Book. It does so by using an entity reference view with the "Content ID from URL" contextual filter.
This set-up does not seem to work with autocomplete widgets according to the original report, perhaps because the widget is posting to something like ajax/foo/bar instead of book/1/add-page.
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9.5
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
This came up as a Bug Smash daily triage target.
Didn't try to reproduce, but sounds plausible that this doesn't work.
Yeah, the context comes from the URL, which is indeed something /ajax/ for these requests. So we would need to pass the current URL along to the ajax request and use that I guess?