[GAMEPLAY] landing Zilean's bomb stops recall

It is not a major bug but it is still frustrating: I was minding my own business recalling and le wild Zilean appears as i am on 0.5 sec to recall he drops a bomb on my head and recall stops. He didn't inflict damage no basic attack no two Q (which is stun effect) just one. I feel like it is same as if Cait or Naut would mark me with their ulty and recall would stop, which doesn't happen. This bug can appear in any game with Zilean.