Bug: Mutually exclusive labels on issues no longer exclude themselves on frontend

Hello there,

Not sure this is the right category.
Tried to find similar issue in the issue tracker and i got kinda lost :smile:
Just wanted to report that on gitlab.com when assiging mutually exclusive labels, they add up instead of being replaced by the new value.
This happens only on the frontend because when I submit changes, it only keep one value.

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