https://bugzilla.kernel.org/show_bug.cgi?id=208981
--- Comment #10 from Florian La Roche (florian.laroche@gmail.com) --- This seems to be fixed after updating to BIOS F12 from 2021-01-18, BIOS Revision: 5.17.
There are even newer BIOS revisions available, but they only work with RAM at 2133 MT/s instead of the usual 3200 MT/s and seem to be unstable.
best regards,
Florian La Roche