The Bug

Glow squid will die from suffocation after one minute when they are riding some entity (minecart, boat, horse etc..) but when is glow squid not riding some entity it will survive only about 20 seconds.

How to Reproduce

1. Spawn glow squid riding some entity outside of water with command 

   /summon minecraft:<some entity> ~ ~ ~ {Passengers:[{id:"glow_squid",Air:999s}]}
   

   2. Then summon other glow squid with spawn egg or command 

   /summon minecraft:glow_squid