The css used to hide any inactive tabs uses "top: -100000px;" to hide the tab. We ended up with a really really long tab. (Probably too long to be honest) The long tab was so long that it would overlap the active content and you could no longer edit the node.
The patch attached uses "right: -100000px;" to fix the issue of long tabs overlapping.
Closed: won't fix
1.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.