Entity metadata broken on BDS

[RaphiMC]

When joining a bedrock dedicated server with ProxyPass (Force https://github.com/CloudburstMC/ProxyPass/blob/master/src/main/java/com/nukkitx/proxypass/network/bedrock/session/ProxyPlayerSession.java#L112 to false to enforce packet reserialization) the entity metadata packets are wrongly read/written. When pressing the sneak key all chunks flicker and the player sometimes starts to fly/glide.

Full bug description / discussion on the discord server: https://discord.com/channels/393465748535640064/599520674737946624/995395815717736620