When on sneak mode the armor is worn incorrectly.

The snapshot you're on isn't 21w14a, it was 19w03a. Link to the bug in question: MC-140950

As stated above already, your game was outdated when experiencing this issue, therefore making this report invalid. Just to inform you, the bug tracker only handles problems that occur in the latest snapshot/release of the game. Please see the Bug Tracker Guidelines for more information.

I wrote the wrong thing now I am going to delete this.