Update: Fixed
Note to all end users running mapping: Using all defaults for the “Job Resources” parameter is a good choice now again. No need to target a particular cluster anymore. Allowing Galaxy to choose the target cluster based on the currently available resources, at the time of job submission, is the fastest way to run tools.
Ticket: https://github.com/galaxyproject/usegalaxy-playbook/issues/257#issuecomment-540676708