Using the delete key in an action item with bullet points below it will create a new action item

Issue Summary

In the new editing experience, if the user creates an action item and puts a bullet point below it, the "delete/fn+delete" key will create an extra action item bellow the bullet point, instead of deleting the content inside it.

Steps to Reproduce

1. In the new editing experience, make sure to create a new page.
2. In this page, create an action item and put a text inside it.
3. Insert a bullet point below the action item
4. Come back to the action item and at the end of it, use the fn+delete for Mac or the delete key for Windows in order to bring the bullet point to the line above.

Expected Results

The bullet point content should come to the action item.

Actual Results

Confluence creates a new action item below the bullet point.

Notes

Attached a video of the behavior:
delete.mp4  

Workaround

No workaround besides manually copying and pasting the content from the bullet point into the action item.