Split operation breaks Markdown formatting in PBI Description

Description

When using the Split action on a Product Backlog Item (PBI) that has its Description formatted as Markdown, the newly created PBI loses Markdown formatting and line structure.

Steps to Reproduce

1. Create or open a PBI.
2. Set the Description field to use Markdown.
3. Enter multi-line Markdown content, for example:

   Line 1
   
   Line 2
   
   - Bullet 1
   - Bullet 2
   

4. Save the PBI.
5. Use the Split action from the extension.

Expected Behavior

• The new PBI should retain:
  • Markdown format
  • Line breaks
  • Overall structure of the original description

Actual Behavior

• The new PBI:
  • Is no longer set to Markdown format
  • Loses all line breaks
  • Shows content as a single continuous line

• After manually converting the field back to Markdown:
  • Line breaks are still missing
  • Content remains flattened into a single line

Impact

• Markdown descriptions become unreadable after splitting
• Manual cleanup is required for every split operation
• Affects usability when working with structured descriptions (lists, paragraphs, formatting)

Additional Notes

• This appears to be related to how the extension copies or transforms the Description field during the split operation.
• It may be stripping newline characters or not preserving Markdown rendering metadata.

No source files or tests are named. Start by locating the Split action's code that copies the Description field, then reproduce the issue with multiline Markdown content. Done means the new PBI retains Markdown formatting, line breaks, and the original description structure.