If have this it is a problem, BMW must fix, I just get new cams with warranty, I find metal in header, I here small ticking but think no more, but when see metal in header, go to dealer, all cams change for free.
https://static.nhtsa.gov/odi/tsbs/2019/MC-10165251-9999.pdf
https://static.nhtsa.gov/odi/tsbs/2019/MC-10165251-9999.pdf