I've found a way to "fix" the bug, it's basically just removing the requirements to leave the house in the code.
go to :"SizeMeUp-1.4.0-pc\game\Ego Dives" then open "Mitsuki_Dive.rpy", go to line 4688 and change the line from' "Leave this place" if mitsuki_exit_lock_frontdoorkey == 1 and mitsuki_exit_lock_diningkey == 1:' to '"Leave this place:"'
yeah not really a fix but if we can continue the story for now well it is what it is