Certain Project Key Pattern can alter how the comment is displayed.

Steps to replicate:

1. Change the project key to ([A-Z]([A-Z]+|[2]))
2. Create a project (For this example, the project key is TST)
3. Comment on any issue, and the comment should contain the issue key number
   • For example, make a comment with TST-1
4. The above steps will alter the comment to TSTST-1

As an example:

• A user write TST-1 as a comment
  
• When submitting or previewing the comment, the comment will be altered