Issue Summary

When copying a task list from the page editor and pasting it, the list appears as if it were newly created, with all marked items ignored. This means any tasks that were checked off or marked as complete are reset, leading to potential confusion as the user's progress and changes are not preserved.

Steps to Reproduce

1. Create a new page
2. Add a checklist to the page
3. Check an item on the list
4. Copy the list from the page editor
5. Paste the copied list on another page
6. Copy the same list from the original page viewer
7. Paste the copied list on another page
8. Validate the pasted content

I created a 3-minute video with the test steps and results. Also, in the video, you'll see the expected behavior working on Confluence 8.5.22
Steps to replicate Confluence issue

Expected Results

The list should keep the market items both times you paste it.

Actual Results

When copied from the page editor, all items are pasted unmarked.

Workaround

Currently, there is no known workaround for this behavior. A workaround will be added here when available.