Cancelling chat events breaks validation chain in multiplayer

[UpcraftLP]

To reproduce:

• be on a dedicated server
• chat regularly
• cancel a single chat event (QuiltChatEvents.CANCEL.register(EnumSet.of(QuiltMessageType.CHAT), /* ... */)
• try chatting again => be kicked with "chat message validation failure"

Verified on 1.20.1 but probably applies to other versions as well.