I wonder why nobody was missing xorg-x11-6.8.1 in Gentoo. It is out since 21. September and no ebuild yet in portage.
Because it only included a security patch, that was added in 6.8.0-r1 to avoid a full redownload of the xorg sources for users.
I was confused by RELNOTES.txt, sorry.
This is a duplicate.
*** This bug has been marked as a duplicate of 64152 ***