Github Actions secrets disappeared?

I have a workflow that build and pushes a -snapshot image to docker hub on any merge. On my last few merges this worked fine, however this morning my colleague merged his PR and the login to Docker Hub fails with “Username and password required”.
I’ve checked the repo, the repository secrets that the workflow uses are still there.
Does anybody have any idea how this is possible / what might be going on, as I’m a bit lost on what to do next. Thanks in advance.
Workflow runs are here, you can see the previous two passing and the last one failing: