Dead slaughterfish doesn't float to water surface after loading saved game

How to reproduce

• kill slaughterfish (it will float to the water surface)
• save game
• load game -> slaughterfish is on ground (underwater)

Debian 9, OpenMW@9ecdcc187f

(RM-4204 from redmine: created on 2017-11-09 by Grigory Latyshev, )

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