Maybe this is a known issue, but I can't run any playbook that uses roles.

It seems like the plugin is somehow finding the role task file and is trying to construct an incorrect path to execute it, instead of the main playbook file.

Here is a simple reproduction: https://github.com/orzarchi/ansible-plugin-repro

Here is the pipeline to use with the reproduction: https://raw.githubusercontent.com/orzarchi/ansible-plugin-repro/master/pipeline.txt

Running it results in the following error:
[Deploy service] $ ansible-playbook repro.yml -i inventory.ini
ERROR: file could not read: /var/jenkins_home/workspace/Deploy service/'/var/jenkins_home/workspace/Deploy service/roles/testrole/tasks/main.yml'
FATAL: command execution failed