Shield does not appear raised to other players during blocking in intense PvP situations (Java Edition 1.21.8).

In multiplayer on Java Edition 1.21.8, a player’s shield often does not appear raised to other players when they are blocking.
This becomes especially noticeable in high-speed PvP, such as crystal PvP, where players rapidly block, move, and interact.
The blocking player always sees their shield correctly, but other players frequently see the shield in the lowered state, even while the player is actively blocking.

This causes inaccurate visual feedback during combat and can lead to unexpected damage because opponents cannot tell when the shield is up.