Issue Summary

Insert and delete in Code Block (e.g. in Description) removes line when using Firefox:

Screen Recording 2025-02-19 at 10.33.42 am.mov

Steps to Reproduce

1. Access Jira using Firefox
2. Create a Jira issue
3. Insert some multi-line text into the code block in Description
4. Move the cursor to the end of a line which has lines below it.
5. Insert characters OR Delete characters

Expected Results

Insert: new characters are added to the end of the current line, and the lines below remain unchanged.
Delete: characters on the current line are removed and the lines below remain unchanged.

Actual Results

Insert: The new character is added, but the newline character is removed.
Delete: The character is deleted AND the newline character is removed.

Workaround

Use different browser, e.g. Chrome