I hope that you are doing well these days!
Thank you for raising the issue, and I am sorry about the experience!
This is very strange to me, as the migration process should act similarly on both platforms. There shouldn't be any different when you open the file on macOS or Windows. As we have never faced this problem before, I'm wondering if you could share with us the problematic file (especially one that has not gone through the migration process yet) so that we can replicate the issue in-house?
I can share with you a link where you can securely send the file to us for investigation. Please let me know if you'll need it!
Looking forward to hearing from you!
P/s: I'm just curious: is there a specific reason why you are still using old objects from previous versions and not replace them with newer ones?
Technical Support Engineer