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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
I think the only way to totally accomplish what you're trying to do would be with a server rather than a realm. You could run a 1.16 server with ViaVersion to allow newer versions of Minecraft to connect to it. I believe that this would maintain 1.16 world generation even when generating new chunks.
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