No change on this side, all setting are identical to last year and I’ve not seen the behavior you describe using the deskop pc browsers, does this only happen for you on the mobile devices? Please provide more information on browsers & OS used.
My edits are being done with Firefox 117.0 (64-bit) for Fedora (v37)
(I browse anonymously with mobile but don’t log-in with it. So no editing there.) Within the last 2 weeks, there was a Dialog on submit that I have NOT seen before. Rather than go to the validation screen that reported a required field was missing, this popped a dialog. So I did not lose the form data. (What a relief!) That was in MantisBT
The behavior on MantisBT is different. It does NOT lose the pending edit when there is a timeout. And forcing the refresh says it will leave the page… but it doesn’t. It re-populates with the edit and you’re good to commit in the fresh session.