Hi. I use the Members plugin to assign Content Permissions to only certain roles on some pages. This allows me to share only specific pages with other users, and they can use fee to edit some content on those pages. For this fee works perfectly.
However I have noticed that if an Administrator (with all capabilities) edits one of those pages with fee, the Content Permissions assigned to the page are wiped (reset to none).
I'm no expert, but comfortable tinkering with the code, sadly in this case I don't know where to look.