I’m using meshpart for my Items in a Viewport and sometimes some object arent showing the first time the viewportframe is displayed.
It reproduce more often in live game.
Here a short video showing the issue. https://i.gyazo.com/808fedac0de0b444da32c762c72552d5.mp4
And here is my setup.
I have the same setup in the game I’m making, except my MeshParts are inside of a model (since I need a hit box with it) and I haven’t experienced your issue. I also saw on another post where someones MeshParts weren’t appearing at all and a roblox staff said the workaround was to place it inside of a model. Not sure if that’ll fix your issue, but it’s worth a shot.