This is where we split hairs. It may not be a defect but in the view of many is IS a quality issue...
Why? Building from multiple pieces of wood is the way it's typically done for structural reasons. Almost anyone that has an opaque finish could have uglier wood than this and no one would say that bass has a quality issue. There is nothing wrong with that bass from a quality standpoint. (Edited to add: I haven't played the bass so I suppose their could be other quality issues, I am just generalizing about the finish)