So if I understand correctly, this happened:

• Added right from meta.
• Added right locally.
• Unspecified rights change locally
• Meta unaware of local rights changes.
• Implied unspecified rights change from meta which overwrote local changes.

You *did* refresh the user rights page on meta after the local rights were added, right?

Not exactluy

• Right added from meta (self)
• Right added at local wiki (by another)
• Right added from meta (self) (overwriting locally applied right — meta unaware of right change) [aware of issue, lodge bugzilla]
• [refreshed rights at meta]
• Rights removed from meta (all is fine)

No I did not refresh rights at meta. Why would I? Not expecting them.

(In reply to comment #2)

• Right added at local wiki (by another)
• Right added from meta (self) (overwriting locally applied right — meta

unaware of right change) [aware of issue, lodge bugzilla]

This is basically bug 38989 but cross-wiki. It's the same issue though.

• This bug has been marked as a duplicate of bug 38989 ***