Same here. Is it platform specific? eg. Mac/ PC?
It's not just the player name that no longer works. You also can't use entity UUIDs or @a/@e/@r/@p/@s.For example:
/tp @e[type=minecraft:goat,limit=1] /tp 2cb92653-8309-4e5f-a625-fcef5ad3e52f
Tested in 21w15a
Same here. Is it platform specific? eg. Mac/ PC?