If you leave a comment on an element and then that element gets removed or changed, the comment is removed. You can still see the comment if you click the link in the email notification, but it does not appear if you go to the page in Figma and toggle to comment mode.
“Unattached comments” - these are really annoying. Every time I click to view an “unattached comment” I see the comment in blank space. I think Figma knows the X/Y position that the comment is supposed to be in, but doesn’t seem to track the correct page the comment was left on.
Same here - very annoying