I’ve seen this happen in Studio and in-game.
With animations, the world can flicker like this:
https://gfycat.com/DamagedGreedyGraysquirrel
Even worse, the character is affected.
https://gfycat.com/DistantReadyGangesdolphin
Alot of the time when I spawn in, my character goes to NaN, NaN, NaN and dies.
I’ve also seen this occur while scripting animations long ago, but only with the character disappearing into death.
I feel like this is related with adjusting animations every RenderStep/Heartbeat.