multiple cockpits can be placed and crash the battle server when its vessel dies

to place multiple cockpits in builder: put a cockpit on a turret ring, copy the turret ring, delete copied turret ring

vessel: https://drive.google.com/uc?id=1D-31KD3FN_2ReLCNXWUYSjB_JKmQPO5c

log:

Skirmish#16.log

[REMStatistics] Flush completed successfully
Stack overflow in unmanaged: IP: 0x7fcb85263fea, fault addr: 0x7ffca8948ff8
Stack overflow: IP: 0x7fcb852b9fd5, fault addr: 0x7ffca8940ff8
Stacktrace:
  at <unknown> <0xffffffff>
  at UnityEngine.Rigidbody.set_mass (single) [0x00011] in <257e6b83319146dabf66db1593a6d4e0>:0
  <...>
  at Module_Manager.DestG (UnityEngine.Transform,UnityEngine.GameObject) [0x0009a] in <50de2d8bb93947ecae4cf3779af0a50c>:0
  at Module_Manager.DestG (UnityEngine.Transform,UnityEngine.GameObject) [0x000a3] in <50de2d8bb93947ecae4cf3779af0a50c>:0