Emails from some sources, primarily Trello, won’t display the message contents. If you forward the message, the new message does display in the forward. This is the only way I’ve found to read them, not a pleasant process on a daily basis. Also some emails wont display content on the first open, but will on the second open. So I open the message, close it then immediately reopen it and I can see the contents. All of the messages in question open everywhere else without issue.