Hm. I tried it manually specifically because I figured that might be the case and it wasn't working a minute ago. But, it worked flawlessly this time, even with the password manager autofilling.Hrm, I just tested on Firefox and it worked, but the "trick" was that I couldn't just use my AutoFill. Notice I manually edited the Zip code (attached photo).
The reason is seemingly that AutoFill doesn't "send the signal" to the site that you've input the data.
I just had to complain, I guess!

