glow squids spawn in the end

i have this huge water perimeter in the end for my wither rose farm and while afking i found glow squid ink in the collection chamber and i thought, thats weird so i went back to afking and when i came back i saw glow squids on the  ground... of the end i also saw axolotls

 

how to reproduce

step 1 fill a large 3D perimeter of water in the end

step 2 you're done