Nope - I have called Apple four times now (I think?) with my same case number, and no one has been able to resolve the issue. What is frustrating for me is that I mark items as "junk," but they keep coming to my inbox. I have marked them as "junk" directly on iCloud from my web browser, and THAT doesn't do anything, either. So it isn't a "MacBook" or "iPhone" mail problem. It is a direct problem at iCloud.
When I first started having the problem in Jan/Feb 2023, it was suggested that I call Apple to resolve the issue. The only replies I've had are, "We will look into this," or "Make sure you have preferences set to ..." (even though this problem is happening across devices and on the website itself). And the best for last (which I am currently doing):
"Make a rule for each Junk message to flag that e-mail sender as "junk."
I am now up to 91 RULES:

This is absolutely absurd and I'm super frustrated, ESPECIALLY since TODAY I had a legitimate notification from UPS about a delivery update for one of the organizations I run. WHY is it in JUNK?? I never flagged it as junk!!!!