Mail showing "This Message has no content"

"This Message has no content" This has been a long term problem which Apple hasn't fixed. I believe it started with Monterey. It was a problem on my MacBook Pro and now it's still a problem with my MacBook Air. Does Apple support read these posts? I haven't called them because it's just a nuisance and thought they would eventually fix it. I always leave my Mail open, rather than quitting. I think it's a problem with synchronizing establishing connection to the mail server and the Mail program loading.

[Re-Titled by Moderator]