Updated to PVE 6.3-3 from 6.3-2, docker does not work anymore.
Linux Docker 5.4.78-2-pve #1 SMP PVE 5.4.78-2 (Thu, 03 Dec 2020 14:26:17 +0100) x86_64 GNU/Linux
dockerd -D output
WARN[2021-02-06T17:02:19.517284672Z] Error while setting daemon root propagation, this is not generally critical...