The following change that was merged yesterday broke some of our tests:
https://github.com/docker/docker/commit/53774423ff0db50cb0934e7b1e5ce507363e8147#diff-5251fbdfab3c1500c0c76ec0d8adf746R78
It's a backwards incompatible API change and prevents older docker clients from running containers on newer daemons. I think it should be reverted unless a compatibility layer is added for older engines.
There's already a PR which fixes this #26751
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There's already a PR which fixes this #26751