On third party servers, when RTX is enabled during login using a resource pack such as VanillaRTX, UpdateClientOptionsPacket is not sent during login.
As a result, the server cannot determine whether RTX activation actually failed or not.
Steps to reproduce
Prepare a computer with an RTX capable GPU.
Set up a third party server that supports packet capture.
Send the VanillaRTX resource pack and capture packets.
Even if RTX is enabled successfully, UpdateClientOptionsPacket is never sent.
Additional information
The GraphicsMode value in the LoginPacket extra data chain is 1 (FANCY) when the client may enable RTX.
However, no UpdateClientOptionsPacket is sent during login, even after RTX is enabled.
Therefore the server cannot confirm the final graphics mode.
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