I verified that downgrading libcap-ng fixes my mounts.
Arch Linux encountered the same issue: https://bugs.archlinux.org/task/68963?project=1&string=libcap-ng
Updating cifs-utils seems to fix it.
it seems updating cifs-utils will fix it as per the comments inside the report
Yeah. I built the latest cifs-utils and it does fix it. I'll submit the package upgrade.