What happens when you don't EndSample in a coroutine that's calling a job?

It looks like it causes hiccup. Wanted the opinion of the dev.

“Try to imagine all life as you know it stopping instantaneously and every molecule in your body exploding at the speed of light.” - Egon Spengler

Maybe the ECS / Jobs forum(s) knows more?

https://forum.unity.com/categories/ecs-for-unity.823/

Is it just a beyond-end-of-frame thread rejoin delay, like it drops a frame perhaps?