I had a similar problem initially (placed the treehouse at the WIllow Creek park) but the treehouse loaded properly once I travelled elsewhere and reloaded into the lot.
Had the same problem (treehouse looks unfinished with enclosure missing and options available but not working) on the rental lot in San Sequoia on PS4. It was the second treehouse I had built in the game, and the first time building on a lot other than my home one.
It was also the first time building a treehouse with help from other sims (specifically, another adult sim and 3 child sims). Before I saw this thread, I figured the problem was a bug in registering the progress due to the sims' help speeding up the build time but maybe it's got something to do with not being on the home lot instead.
(I have all dlcs except for luxury party and any CAS kit. Version says GP12: 1.assets.live2-console-gp12.22 )
Edit: Reloaded game and full treehouse was there. Thanks for the fix @Legitimatetea and for starting thread @AuroraLuci! (:
Yeah, I had some San Myshuno Sims build a treehouse in the Oasis Springs park. They added a slide pole before they left and it’s not usable, alas.
I’ll try deleting it and rebuilding a new one.
[edit] I can confirm that not adding any upgrades and traveling allowed the treehouse to function as usual, even if it looked weird when we left.
if leaving a lot and returning later, can you add Upgrades?
