For me, the dilemma with kernel's 5.13 also persists. Where I also agree with towo that this is not due to the kernel. With me desktop system:
inxi -Sxxx
System: Host: sidukde Kernel: 5.12.17-1-siduction-amd64 x86_64 bits: 64 compiler: gcc v: 10.2.1
Desktop: KDE Plasma 5.20.5 tk: Qt 5.15.2 wm: kwin_x11 dm: LightDM 1.26.0
Distro: siduction 16.1.0 Patience - kde - (201702251051) base: Debian GNU/Linux 11 (bullseye)
# <file system> <mount point> <type> <options> <dump> <pass>
UUID=045398f2-dfbc-4cc5-99c5-dca098051969 swap swap defaults,noatime,nofail 0 0
UUID=ef032757-1572-40fc-902f-1264499961a4 / ext4 defaults,noatime 0 1
UUID=C61C-895C /media/DATEN vfat auto,nofail,uid=1000,gid=1000,rw,quiet,umask=0000,shortname=mixed,iocharset=utf8 0 0
UUID=6EDE-B072 /media/Distris vfat noauto,nofail,uid=1000,gid=1000,rw,quiet,umask=0000,shortname=mixed,iocharset=utf8 0 0
The only noticeable thing is that all users involved here use an older installation, which was kept up to date in the years until today.
In contrast, the Farewell-Test installation on a laptop of mine has no errors, although a vfat file system must also be mounted there!