Unable to push to (private) registry

[Code0x58]

When doing kompose up on a file which has build+image information, it builds the image and then it looks like it tries to push it incorrectly:

INFO Build key detected. Attempting to build and push image 'my.registry.com/my-namespace/image:latest' 
INFO Building image 'my.registry.com/my-namespace/image:latest' from directory 'image' 
INFO Image 'my.registry.com/my-namespace/image:latest' from directory 'image' built successfully 
INFO Pushing image 'my-namespace/image:latest' to registry 'my.registry.com' 
INFO Attempting authentication credentials 'my.registry.com 
ERRO Unable to push image 'my-namespace/image:latest' to registry 'my.registry.com'. Error: An image does not exist locally with the tag: my-namespace/image 
FATA Error while deploying application: k.Transform failed: Unable to push Docker image for service image: unable to push docker image(s). Check that `docker login` works successfully on the command line

docker-compose build && docker-compose push doesn't have an issue with this.

To bodge it at the moment I remove the build information and do docker push my.registry.com/my-namespace/image:latest before running kompose up.