If you place a bomb on the ground with Zilean and Syndra puts a Q over it will just disappear. It's was really annoying in team fights because Zilean and Syndra will most likely place their Q about the same spot to deal damage.
Indeed. I encountered the same thing in an ARAM yesterday, I got really annoyed on the fact Syndra kept throwing her balls on my bombs.
So I went into a custom game with my friend to test it out, and what do you know? Syndra did break Zilean bombs, increasing my saltiness.
I don't know if its intentional or not, but if it's not I hope they fix it. 
