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Untamed wolves and ocelots disappear

You can fall through the floor on a unloaded chunk in multiplayer.

The player gets stuck upon entering unloaded chunks above cloud level

Player is removed from the EntityTracker when teleporting to unloaded chunks or changing dimensions, resulting in client side desync

Loaded crossbows look unloaded in item frames and when dropped on the ground

Scheduled ticks get lost when leaving chunks (Redstone components get stuck)