Using /clear on more than 1 player will stop clearing inventories once an empty inventory is encountered

How to reproduce: Join a game with 2 players with empty inventories. Run /say @a. Give the player with the last name on that list an item. Run /clear @a. That player will still have his item. Example: redstonehelper and relper have an empty inventory, relper is given a stone sword. /clear @a will not clear that stone sword.