@sanderweel, @Emmanuel_perez, sorry for the silence on that issue; I personally am extremely short on time lately and couldn’t find the time to properly help with that. Thankfully, @sanderweel made a very nice find, well done!
It’s unfortunate that this happened; it’s apparently a bug on docker’s 20.10.6. Thanks to @sanderweel’s finding, it turns out it is a known issue:
https://github.com/moby/moby/issues/42288
Fortunately, a fix has already been merged:
https://github.com/moby/moby/pull/42413
… and is included in the next release 20.10.7:
Hopefully it’ll land in the openSUSE repos soon.