I don't recall which shiny chrome cap I got 20+ years ago, but I seem to recall the instructions explicitly stated to move the o-ring from the plastic OEM cap over to the chrome one.
(Which I did 20+ years ago and have had *Knock on wood* no issues with that.)
Yes, the new chromes did not come with O-rings but instructed using the ring from the OEM.
To much misinformation is posted by "experts" with no experience. Reminds one of Congressional hearings.