Copying comments from Jira into Confluence editor prevents saving the page

Issue Summary

This is reproducible on Data Center: yes

Unable to update/save a page after pasting a comment that was copied from Jira, it results in "There was an error processing the request." error. see screen recording

This issue didn't exist in older versions of Confluence like 7.19.17.

Steps to Reproduce

1. Go to Jira >> open a Jira ticket that has comments >> Copy one of the comments (including the date)
2. Go to Confluence >> edit a page >> paste the copied comment
3. Try to update the page

Expected Results

The page should be published without any errors

Actual Results

The page can't be updated, and the editor can't be closed, it shows the error when clicking "Update" or "Close"

Workaround

Click on the date picker in the comment that was pasted in the page, then choose a date, and then update the page.