If visitor don't use cookies, but I set UserID, "Visits by Visit Number" don't work

I did some experiments and know that “Visits by Visit Number” show the correct result only if visitors used cookies. If they did not use cookies or you send a request with “PHP Tracking Client”, it will be incorrect independs set UserID or not. But I think it’s wrong, cause if I set UserID, I must have absolutely full information. Can you fix this bug, please?


This sounds a bit like

which has been fixed in Matomo 4