Oh that freeze is still an ongoing feature. When buildings or big objects are added to the map, the navigation stuff is updated and sometimes a little freeze can occur. That's annoying but I'm still trying to improve this part, it's kinda important to allow the characters to walk anywhere they want or just being able to wander in a new house without being stuck in front of a staircase X)
But about the previous problem I'll keep searching, maybe I'll find out what happen ! Thank you for your feedback it's really cool !