Hi, I and the creator of the "Tutorial Secrets" thread have had the same issue. Ive recently found out that the way to prevent this is to turn on your player physics damage, itll give you a bit of damage but force you to crouch instead of ragdolling when you fall onto the boxes. You wont need it again afterwards, so grabbing the core(which is still there, just in a different location), ragdolling, then switching back to no player physics damage wont cause further issues.