When you are in the Client is everything in the entire Explorer workspace gone, or is it showing there but not in game?
I can see your Player and a few other items in the screenshot, but if your camera is inside a Part then the Part disappears.
Literally the issue. This also happens in other places, Like 90% of the map is destroyed other than some random meshes. Everything in the workspace also gets deleted. Not on the server though.
That looks like there’s some script deleting everything on the Client.
Did you use the Explorer search bar and type in instance:script? EDIT use classname:script instead. It might help you find scripts you didn’t place there that may have been put in by a harmful plugin or free model.