Hi everyone,
Thanks for sharing your updates on this. Could you please confirm the exact versions of Illustrator and InDesign you're currently using? The latest ones are Illustrator 29.8.2 and InDesign 20.5. Are you on these builds? It would also really help if you could share an affected sample file where this duplication happens, so we can test it directly and check with the team.
Looking forward to your update and the file, so we can investigate further.
Abhishek