I have assigned 'Project Role' for workflow transition in two cases:
1. I assign one project role at a time i. e 'developer' OR 'scrum master'. In this scenario transition button is visible on issue page, for both roles.

2. I assign two project role at same time i.e 'developer' AND 'scrum master'. In this scenario transition button is invisible on issue page, for both roles.

I have make sure to publish changes so that's not the reason behind this.
Kindly correct me what I am doing wrong OR what I am missing here.
Thanks in advance!