I've noticed recently after system reboots that Firefox forgets the "Open previous windows and tabs" setting and restarts with only a blank tab. I've confirmed that this setting is ticked prior to the reboot. I know I can restore the session under History but why isn't Firefox remembering this setting and re-opening the windows & tabs like previously?

Running Firefox 135.0.1 and Mac Sequoia 15.3 (but has been happening in recent previous versions of both).