I find that Proton Pass isn't great at detecting username/password fields and sometimes just fails miserably for seemingly no reason.
I've had your issue before but it just started working again without any interaction by me. My only suggestion is standard stuff like rebooting the phone/uninstall-reinstall/etc.
No, predicting the future by way of esoteric knowledge is not real. Anyone who says they can do it is delusional or lying to you.