Once happened to me. Something broke in macro function and I can not change parameter type to a wildcard.
Was changing to any type without problem, but not to wildcard.
Can not reproduce 
But no errors was in logs when that happened.
Once happened to me. Something broke in macro function and I can not change parameter type to a wildcard.
Was changing to any type without problem, but not to wildcard.
Can not reproduce But no errors was in logs when that happened.