@Nowak, Wawrzyniec Thank you for reaching out to us, would recommend to check/list all the digests in the registry to confirm container image is not present.
You can run the commands mentioned here - https://learn.microsoft.com/en-us/azure/container-registry/container-registry-get-started-azure-cli#:~:text=List%20container%20images to list the repositories in your registry.
if its confirmed its not present, would recommend to work with our support team to investigate this further where we might need help from our engineering team as well.
Do you have the support contract with us to create a support ticket ?