I don’t know how correctly I understood your text, but on my laptop, when I write a post, press the back button, and then click again on the page to print the post, everything is saved. Maybe the problem lies when using mobile gadgets. I deliberately tried to do this, but maybe this happens after a pause.
Yeah, if you clicked back arrow accidentally, then you have to click forward and your text is saved. Just don't reload page because then your text will disappear.
It's not just on PC, this thing works on mobile too. I also remember once that when my browser crashed and after I clicked restore previous session, my text was there.