Happens to me too, and I'm also on a laptop with Windows and Chrome. However, for me the issue isn't as much the previous comment hanging in there, as the disappearance of the 'Clear editor' option. I used that button frequently in the past.
Hmm, the clear editor option is still there, but only in certain circumstances. Like when I just tried to write a comment on a Leopard Hunt chapter and it wouldn't post. I then refreshed the page and the comment wasn't there. But when I opened the comment box the old comment popped up, including the option to clear the editor. I posted the comment instead, but it was nice to see this very helpful feature work. I love that we don't lose comments like we used to, so thank you again for that, Myr.