Lost crown bug

After playing the lost crown event three times, I haven’t gotten the crown a single time

It’s not a bug.There is only a small chance of getting one after the match.

I won the match and it said: monsters acquired: crownbug or what it’s called but then, no crownbug to be seen in my monster inventory! :’(

How small chance? Tried several times (10+) and still no crown