Since I'm unable to actually submit a bug report because I'm on a free cloud plan, I'm posting here in hopes that someone will see it.
Today I ticked a checkbox on a to-do item in an issue on Jira. The issue is a child issue. When I ticked the box, the issue refreshed its description which removed all of the information that had been there, and was replaced with the exact same text as the parent issue.
I was able to restore the description by viewing the ticket's history and copy-pasting the description from the last edit. I attempted to recreate the bug but on the second time, when I ticked the box, the description stuck.