Expected Behavior

1. Create a Component with a HoverEvent.showEntity().
2. send it to a player connected to the proxy by player.sendMessage().
3. The client of the player show the component in the chat correctly with the hover event.

Actual Behavior

Immediately after the message is sent. The client unexpectedly disconnected with a reason of internal exception occurred: JsonSyntaxException: Missing type, expected to find a string

Steps to Reproduce

Optional<Player> optional = proxyServer.getPlayer(...);
Component message = Component.text(...).hoverEvent(HoverEvent.showEntity(...));
optional.ifPresent(player -> player.sendMessage(message));

Plugin List

Only my plugin on the velocity and no plugins on the backend server.

Velocity Version

> velocity info
[22:50:17 INFO]: Velocity 3.4.0-SNAPSHOT (git-5eb83760-b506)
[22:50:17 INFO]: Copyright 2018-2023 Velocity Contributors。Velocity 以 GNU 通用公共许可证第三版授权。
[22:50:17 INFO]: PaperMC - GitHub

Additional Information

The client minecraft version is 1.20.1. Possible reason of this bug may be the PR #1564 that introduces support for new hover event schema in 1.21.5 controlled by JSONOptions.EMIT_HOVER_SHOW_ENTITY_KEY_AS_TYPE_AND_UUID_AS_ID. This option is FALSE by default which means it has to be explicitly set to true in the OptionSchema. However in the com.velocitypowered.proxy.protocol.ProtocolUtils only MODERN_SERIALIZER set that option to false explicitly , leaving all other serializers use the default value false, which may cause all versions prior to 1.21.5 to encounter same problem because the type key is missing.