Realms: failed to connect to server incompatible client

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What I expected to happen was...:
Tried to connect to Realm. 1.19.1. Given a message several times Failed to connect to the server Incompatible client! Please use 1.19. Am using latest release...

What actually happened was...:
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...