When a flat part is placed a few hundred studs above another flat part, when falling the part will clip under the other part,
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Thank you for your report. Unfortunately, this behavior is a known limitation of our collision system. Because our collision system is based on discrete events, collisions between fast moving objects can be missed, allowing tunneling to occur. In this case, the falling part picks up enough speed such that it tunnels through the top part and collides with the baseplate instead. Once it has come to rest, the collision system depenetrates all the parts and we end up with the order switched.
We are investigating methods that can address this problem but it will be a while before anything can be delivered. In the mean time, increasing the thickness of the parts should help. You can also try limiting part speed to ensure no collisions are missed.
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