Is the Megalodon easter egg triggered randomly?

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On the bigger Fort de Vaux map (not on TD or Domination), there is a small water puddle which triggers a Megalodon jumping out of it, eating the player. I tried several times but the easter egg didn't trigger.
Does it trigger randomly or is something wrong with my game?
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Images: Jill Wellington, Eren Li, Oliver Wiesenberg, Pixabay