I have issue with this addon working together with Simple Tab Groups (by Drive4k).

Occasionaly, when switching between tab groups, last selected tab (I mean current active tab) "moves" to switched group and "stays" there as last tab.

I was unable to reproduce this reliably to find exact cirquimstances.

Disabling either of these two addons of course removes the issue.

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Update: I have figured this issue out.

When I switch from group A to group B and then right away close active tab in this B group - I am switched back to A group. That works like it should be: last active tab becomes that one in A group.

But if I switch back to group B again - then any active tab from A "moves" to group B.

Disabling your addon resolves this issue.