So recently,
My team and I had released a game known as Free Falling Simulator
Now after we had published this game to a new server for release yesterday we started to experience the following issue.
Half our levels becoming invisible only in studio.
If they are 100% Studio parts, I may not know the answer. I’ve solved how to fix this problem with meshes. Double check to make sure the transparency is set to 0. I may not have the possible solution, maybe try naturally playing around with this.
Have you checked the FallenPartsDestroyHeight property, in case you positioned those models under the height?
If it’s a studio problem, is your Roblox Studio on the latest update? If it’s just invisible and you can still select the parts from Workspace, try do that and copy them to new game to test if the same problem still occurs.