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I believe that issue was with xtr cassettes?
from Shimano:
"M9100 cassettes ship with a thin plastic shim that goes behind the largest cog, and it snugs everything down. If it came as OEM part on a complete bike, it's possible that shim wasn't installed, and that can cause creaking. Please remove the cassette and verify it's there."
Thanks @motoko and @danb - I figured the silver was a spacer. The rubber thing is very flexible and its profile is round as opposed to flat like a washer. So maybe Dan's suggestion is correct. You wouldn't normally have a washer behind a cassette would you?