@Chules - just wondering - you haven't accidentally limited the number of cores on the i9 Cinebench in the preferences have you? (Something I've done before!)
To the best of my knowledge, I believe that I am performing the test correctly and there are other people with the same results. Attached screenshot of the test. When you perform the test, 20 buckets can be viewed. This same test in mac Studio yields a score of 24,000 points compared to 13,000 for the iMac i9 10C/20T.
Value you, I speak from limited knowledge in terms of hardware.