can be abused to farm eggs

BabyMobs-1.12-1.5.4

it's not working all the time, seems to be easier on servers.
sometimes you have to wait some minutes for the dragon

[Server thread/INFO]: Scanning for legacy world dragon fight...
[Server thread/INFO]: Found that the dragon has been killed in this world already.
[Server thread/INFO]: Found that there's a dragon still alive (Entity BabyDragon['Baby Dragon'/1603, l='world', x=-0,06, y=65,34, z=-4,60])