I have been dealing with this situation since a few years ago... periodically I check the situation to see if anything changes, apparently without success.

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I wonder if I'm missing something fundamental...

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I have a website on a domain, which is working well and ranking as desired.

5-6 years ago, the same website used to be on a different domain. Plus, some domain aliases where 301-redirectin to the (at the time) main one. Now, the old aliases and the old domain are all 301-redirecting to the new one.

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After so long, many URLs from the old domains are still indexed on Google... while I expected to be none.

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In the same GSC, I verified all the domain properties (not the URL prefixed ones) for:
- the "new" domain
- the three "old" domains

Everything is verified. I remember that in the old GSC I correctly did the domain transfers procedures. All the 301 from the old domain and old aliases are verified and their http status code is correct

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Anyone can give some clarification on the process?

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Thanks.