Yep mine do the same thing when they have a new condo design. They enjoy spending the time in there and sometimes don’t want to come out. Tucker is like that. She likes her door open so that she CAN come out, most times she’ll bite the bars until I open the gate to it ..but then she’ll run up and hang out on one of her levels and not come out for HOURS if not all day!!! She likes the option of coming out..but not necessarily the coming out itself. LOL
Drue on the other hand..once that door is open he’s off! He runs around for a bit, takes a nap in the bathroom and then later will come back and hang out in his condo. But unless the door is closed he’s on his bottom level or on his “front porch” which is the area where it’s plywood covered with tile but is outside the condo walls. He likes to lounge out there..close enough to his litter box, his hay and his water but still outside the condo.