Email Notification for User Mention broken when specific characters are in the page body

Problem

Email Notification when a user is mentioned can break when the page body contains some special characters

Steps to reproduce

(Only happens in TinyMCE)

1. Create a Page using the Storage Format below:
   table storage format.txt
2. Mention a user in the Comments column

Expected Result

Email notification received by the mentioned user should include the page body content normally

Actual Result

Error message below is in the email notification

Error: [com.ctc.wstx.exc.WstxLazyException] Unexpected character '<' (code 60) excepted space, or '>' or "/>" at [row,col {unknown-source}]: [1,327]

Workaround

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