Similarly to MC-1133, pressure plates don't activate when the player is standing off the edge of the block. They only activate when the player's hitbox intersects the bounding box of the pressure plate block.
MC-266549
Pressure Plates Don't Trigger When Standing on Edge of Block
Resolved
Invalid
0
Your hitbox doesn't intersect the actual pressure plate in this scenario. Pressure plates only trigger if it's intersected by a hitbox. This has nothing to do with MC-1133.
Change request ("make it use full block width") not a bug.