This has two effects:
- Will no longer send queued chat packets from previous server after switch (race condition)
- The offset in 'last seen' updates will be corrected, as the internal ChatState will be reset (only applied if the player had not sent a message in a while, and >20 messages had been received)
The Vanilla client will send 'last seen' even if the message is not signed, so this is much stricter than it needs to be. This should allow commands without any signed arguments to be modified/consumed by the proxy.
This is hardly useful in the case of signed player chat messages, as these fundamentally cannot be spoofed or modified - however, for any unsigned input (particularly commands without any signed arguments), 'last seen' updates are still required and should be passed through in a consistent state.
