Comment by price

They're reverting this developer's previous changes, because those changes were bad.

More on those previous changes here: https://gitlab.freedesktop.org/xorg/xserver/-/issues/1797#no...

Definitely some blame also belongs to the Xorg committer who reviewed and merged those changes (and it looks like that person understands that in retrospect). But the primary responsibility for getting a change right is the author's.