Test Parameters are not working whenever Jira's Rich text editor option is disabled

Description
Test Parameters are not working whenever Jira's Rich text editor option is disabled.

Pre-conditions
Disabled Jira's "Rich text editor":

How to reproduce

1. Define Parameters in a Test Dataset:
   
2. Map the Parameters in the Test Steps:
   

Actual result/Attachments
Parameter suggestions and formats are not appearing, meaning that Test Run Iterations will not be adequately created:

Expected result
Everything works as it should, the Parameters are correctly mapped, and Test Run Iterations are created.

Version

• v6.1.2.1