Kerbal Space Program

How to reproduce: take a fairing, attach either a heatshield with enabled staging or some decoupler with a part beneath it to the fairing. It can be the main fairing node or interstage node, doesn't matter. Then close the fairing on a heatshield or a part. Launch craft, then try to decouple. Parts that supposed to be decoupled stay attached as if they are still on the same vessel, but they are not. You can switch to them as shown in the second video, but they behave as if they are still attached. When you enable time warp, warp physics completely fail and decoupled parts just fall to the ground and explode.

Video #1: https://youtu.be/7JU48QKtN8Q
Video #2: https://youtu.be/wvLroh3tsSc