I use safari on Mac, MacBook, iPad and iPhone, the problem is the same on all of them.
The list does come up but when I select something the auto-save notice isn't there and doesn't appear when I select another field either. But does appear when I type in the text field normally, but only when I click another field or the 'view this page' feature does it actually come up.
What I mean is that it doesn't save what I've written at the time, but anything I've written beforehand is still there.
I tried the F12 thing and nothing happened, I don’t know if I’m doing it wrong or not but it just turned my volume up which is what it normally does, the photos you attached aren’t visible, they’re just tiny blue boxes with question marks to me.
And I don’t think I have access to an incognito windows, as you put it.