Containers disappeared after upgrading Docker Desktop on Mac

upgraded Docker Desktop to 3.4.0 (not sure from which one, I believe just from the previous release as I usually keep everything uptodate) on Mac OSX11.4 and none of my containers appear anymore!
docker ps -a is empty

~/Library/Containers/com.docker.docker/Data/vms/0/Docker.qcow2 is 13GB, so they seem to be on the filesystem still

I tried restoring from timemachine, when starting it, it needed to restore factory settings, but that hung overnight

Any idea?

deleted… sorry … my fix broke stuff.