Mail app junk mail blocking reaches its limit on macOS

Just started getting this in Tahoe and I thought it was some kind of glitch, but it continues in Golden Gate as well. I can't imagine that there would ever be a limit when it came to blocking junk mail considering the sheer volume of it. Is this something that is gonna get fixed?? If there is a limit why not like Time Machine, when the list starts to fill up, have it remove the oldest blocks so it can continue to function???