a weird noise comes out in about 1 sec with b5 & C6 ONLY with Trumpet field: coast is clear.

To Spitfire lab,

When I use Trumpet field: coast is clear with b5 & c6 in about 1 second, there is a weird noise comes out. No other notes show this problem with this timbre and no other timbres show this problem in b5 & C6.