I play on a Bedrock Dedicated Server. When I built a river-based squid farm no squid would spawn on the world. I copied the world to my pc and ran a copy intending to go in creative to diagnose the problem only to find out that squid started spawning immediately without any changes to the settings. That is the only variable that changed. I can only conclude there must be something wrong with the server version of the game. Another possibility is that when I copied the world from the server to the pc it cleared all the mobs and its behaving as if I ran a kill all command. I did not change any settings when moving the world. My world is too big to attach but I am willing to submit if requested. I don't remember the last time I saw a squid spawn in the river. In windows 10 edition it worked just as expected.