Yep, this is the root cause. For some reason Labels field has been removed from some edit screens during Jira upgrade (7.13.x -> 8.5.x). Anyway, it's still present in all view screens! Also it's present in most of screen schemes, so this affects only some screen schemes.
Why this has happened? And how it's removed from some edit screens, not all?
Fixed this by adding Labels field back to edit screens based on end user complaints.
Solution that worked for me : The labels system field is not associated to the respective screen causing the inline editing is disabled in the Edit Issue screen.
I've been having the same issue after the Jira 8.5.3 upgrade. The labels are in the edit screen but still unable to edit via the in-line edit function.
I can't seem to delete my above comment. In-line edit on labels does work. The user in this case did not have edit permission.
I had same problem and the way I fixed it was by going into labels configuration and just adding the screens back
Same issue here. But I think I've found the reason. There seems to be https://jira.atlassian.com/browse/JRASERVER-44693 in the Atlassian issue tracker and linked issues that seem to speak about this problem. But seems that Atlassian fixed the problem without closing the issues.
Doing a comparison from Jira 7.x with Jira 8.x I've found that in Jira 7.x the labels field was editable because it is always editable; despite if you add the field to the screen or not.
In Jira 7 there was a blue pen there to edit it.
In Jira 8 if you do not put the Labels field in the screen you cannot edit it anymore with this "default functionality" of editing labels provided by Jira 7.
I think they have fixed a problem anyway because in Jira 7 it was possible to edit Labels even if you have not added the Labels field in the screen.
If you have your old Jira 7.x instance still on-line (or a lower version I can imagine) you can verify this by yourself comparing the screens configurations.
All of this means that Jira 8 has not removed, unconfigured or deleted anything during the upgrade: the field was not present on the screen even before the upgrade.
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