[MC-73062] Ambiguous Realms error "Incompatible client, consider updating" at newest snapshot

When trying to connect with Minecraft 1.8.1-pre1 / 1.8.1-pre2 to Realms, that message is thrown:

Client Incompatible
Your Client is not compatible with Realms, please consider updating it"

at least of today, there is no way of updating the client.

Linked issues

I think you were just a split second too late, as this just barely duplicated the ticket before it, MC-73061.

^{Note to self: Need to type faster}
This ticket is not about the inability to connect to realms, but about the ambiguous error message.

Haha, alright then. Two tickets side by side, and extremely closely related.

Will be fixed in next Realms client release