Reproduction Steps
If a RenderingTest object is parented to game.TestService and it is destroyed while a TestService session is running, Studio will crash.
To demonstrate, run this script in the Command Bar or a Plugin:
local RenderingTest = Instance.new("RenderingTest")
RenderingTest.Parent = game.TestService
game.TestService:Run()
RenderingTest:Destroy()
Expected Behavior
Either the TestService run should be cancelled or nothing should happen at all.
Actual Behavior
Roblox Studio crashes with the following dialog:
