The correct term for the "bark pocket" is wane. Since that is a truss, I don't think it will jeapordize the integrity of the structure. If it were in a rafter it would be different. The main issue would be that the nailing surface is reduced, but I don't think that it would be an issue as it appears to be installed. You can recommend sistering as a CYA, but I wouldn't press the issue too much.

__________________
Integrity Inspection Service, LLC
www.irsindy.com
(317) 345-1828