Axolotl + glow swuid spawn in swamp under lillypad

I was playing in my world by ther swamp when i noticed tons of axolotl and glow squid in the water. I went to investage and saw them spawing under lilly pads so i checked the snapshot changes and sure enough it met the requirements. the water level ,y, was 63 and they were under a block (the lilly pad) so they could spawn there. pls fix this cuz it would take the fun out of seashing for they mobs if we can get them from the swamp