I was checking the oil level and to my surprise I noticed something looking like there is a piece missing from inside the oil filler neck. This is the first time am seeing this. I don't know if it was like that from new. For sure looks like there is a big chunk broken from inside. If that is the case, where is the piece
. There is nothing unusual when the engine is working. Can someone please check and confirm whether there is something broken or this is normal design of the filler neck.