When making a new game from the “Create” tab, the game template titled “Move It Simulator” lacks a thumbnail/preview image/whatever you’d like to call it.
This is in contrast when selecting the template from Roblox Studio. It does include a thumbnail.
It happening ever since the template was made available for developers to use.
Repro: Go to Home Page on Roblox > Create Tab > Create New Game > Scroll down until you see Move It Simulator.