During update, get: You do not have permission to edit issues in this project

As a full JIRA account holder (has jira-users group, referred in the default DESK Role 'Request participants') with specific EDIT_ISSUE permission (by role and name) in a the demo DESK JSD project: Using IssueService, I can create issues without a problem, but IssueService.validateUpdate() returns an error You do not have permission to edit issues in this project.

I've traced this to be the call permissionManager.hasPermission(Permissions.EDIT_ISSUE, issue, user), I lost track inside what I think is a custom impl of the permission manager?

I log this as a bug, because, the user has EDIT_ISSUE permission, there are no workflow step restrictions that would prevent this, and if JSD is disabled, I don't see this running the same test in the same project.