Other players can steal items from a chest while you are carrying it.
The concept relies on manipulating Minecraft’s entity ride logic. When a player "picks up" another player, the game code is essentially telling the target player to start riding the carrier. While simple in theory, the execution is complex due to how Minecraft handles player hitboxes, movement physics, and input priorities. Pickup Carry -1.21.50 -Pick up the player- mo...
: The addon allows you to move blocks that contain data—such as chests, furnaces, and hoppers—without needing to empty them first. Cross-Mod Compatibility Other players can steal items from a chest
It sounds like you’re referencing a behavior pack or add-on for (version 1.21.50), specifically one that lets a player pick up and carry another player. While simple in theory, the execution is complex
You can also "launch" the carried entity or block far ahead.
The addon for Minecraft Bedrock (v1.21.50 and above) allows players to pick up, carry, and relocate blocks, animals, and other players. Core Mechanics
“Carry On! Moving Storage Systems is the absolute worst... but Carry on makes the whole process much easier.”