Fixed in today's v97 stable release. Hooray
After update to v97 on stable update stream, the option to enter the sync passphrase is back. After entering my passphrase, the synchronization resumed.
Best posts made by jan6mares
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Opera for computersRE: No option to enter sync passphrase
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Opera for computersRE: No option to enter sync passphrase
It seems there is a fix on developer:
https://blogs.opera.com/desktop/changelog-for-98/
DNA-104983 Missing encyrption option in sync settings
Hopefully it will come to stable soon.