Custom animations causing flashing world and disappearing character

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.

Are you using invisicam?

Can you insert the animation through insert service and check if any of the poses have math.huge values?

Can you post a link to a place that has this issue?

Issue is here: Mocapped R15 Animations v1.71 - Roblox

No, I’m not using Invisicam.