SharePoint 2013 workflow not visible to some users

Hi All, 

I have a SharePoint 2013 WF on a list (SharePoint 2016 on-Prem). 

Under the following scenario, the WF is NOT visible to the user

- User has Full Control on List

- User has only Read permissions at the site Level (Visitors group)

Under the following scenario, the WF IS visible to the user

- User has Full Control on List

- User has Contribute permissions to the site (Members group)

I don't want the user with more than Read permissions on the site. But do want them to be able to see the workflows on the List and invoke them. 

Any thoughts?