A page Preview is unavailable error is generated when attempting to view the preview while hovering over a link of a page, if the page is a redirect.
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Description
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I cannot reproduce with a clean redirect link. (in Firefox 65.0.1 (Linux) nor in Chromium 71)
You can Test it at https://en.wikipedia.org/w/index.php?title=User:Quiddity_(WMF)/sandbox&oldid=885582095
My result is a proper HTTP 302, and fully functional PagePreview:
(Links and examples always help! Please try to make life easy for each other :-)
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(For future reference, please include browser information, browser version information, test with a clean browser profile, and include a link that allows others to test. Thanks!)
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@Aklapper - I normally do, I didn't report this immediately and was in a bit of a rush. I'll try and work out what went on later.