It doesn't appear to be a desync: The Player has the wrong position serverside as well. I tested this by mounting myself on a Block Entity and running execute at @s run summon minecraft:bee ~ ~ ~ {NoAI:1b} in chat. The bee appeared right where I was sitting.
It doesn't appear to be a desync: The Player has the wrong position serverside as well. I tested this by mounting myself on a Block Entity and running execute at @s run summon minecraft:bee ~ ~ ~ {NoAI:1b} in chat. The bee appeared right where I was sitting.