Using a credential with a question mark in the password is causing the docker-build-step plugin to fail when accessing a private repository in the docker hub.

In the docker log I can see the following message when trying to run a docker-build-step command (output from a docker pull step):
level=error msg="Attempting next endpoint for pull after error: unauthorized: authentication required"

As soon as I remove the question mark (and replace it by any other character including #) the docker pull is working as expected.

The credentials themselves are properly setup - I am able to execute the build and publish step from the CloudBees plugin - with or without the question mark in the password.