Sortby iterations are not working for priority field

Description
Sortby iterations are not working for priority field

How to reproduce

1. Create 3 issues with 3 different priorities (high-medium-low)
2. Filter by those issues with a for iteration and sorting by priority desc

   &{for issues|filter=%{'${IssueTypeName}'.equals('Epic')}|sortby=Priority desc}
    ${Key} - ${Priority}
   &{end}
   

   (example)
   Actual result/Attachments
   

Expected result
The priority should be sequential

Version

• 6.2.5

Environment

• <environments>