manifest invalid: Only schema version 2 is supported

[tommywalkie]

I'm currently enjoying and using gpr-docker-publish for some blog project. It is working pretty well.
This morning I suddently runned into a strange issue when pushing a successfully built image with the SHA.

[DEPRECATION NOTICE] registry v2 schema1 support will be removed in an upcoming release. Please contact admins of the docker.pkg.github.com registry NOW to avoid future disruption. More information at https://docs.docker.com/registry/spec/deprecated-schema-v1/
manifest invalid: Only schema version 2 is supported

As far as I understand logs from my last two actions, the first push without the SHA (docker push ${BASE_NAME}) is still working.
Is it something related to the Docker runtime mentionned in the gpr-docker-publish 's Dockerfile ?

FROM docker:19.03.2 as runtime

[tommywalkie]

Tried to re-run the Github Action and it just works (link), now i'm not sure what happened back then, I would be ok to close the issue, but I would appreciate some insights, just to make sure.