the bug is actually for 1.20.5 but the system would not allow me to input that version

In creative mode, I used the command /summon and chose the Ender Dragon option so it could clear an area for me. I accidentally summoned two of them to the location.

However, when I go to kill them using a command after the area has been

I did /kill @e {{_[distance=50,_ type=!player] }}

but I got "no entities found" despite the fact that there are TWO Ender Dragons right by me and they are definitely within 50 blocks. 50 blocks is quite a ways. and the two Ender dragons are just above me.

It seems that the kill @e cannot find these two Ender Dragons for some reason.