On one box I had previously manually edited /etc/yum.repos.d/almalinux-baseos.repo (and some others) so ended up with a bunch of .rpmnew files which i had to mv over the .repo files before the upgrade would work.
Had the same happen on 8.8 beta too.
Also CRB is disabled by default so I had to add
--enablerepo=crb to allow some glibc/gcc packages to update which were otherwise causing conflicts.
Otherwise had no issues with seven upgrades so far (plus two 8.8 betas).