Occurring both on local save and on a realm:

 (I will try to provide images that correspond to this report!)

1. Squid are not spawning in a Squid farm.

2. The farm is made of 64 flowing water columns, each with an air column in-between.

3.  The columns range from Y-64 to Y-43, and are arranged in a square.

4.  The farm was made in a river biome - we confirmed the river biome by finding clay, salmon, and even that squid were spawning in this river before we made the farm!

5.  We drained all water in the area, including rivers and ponds.

Even with all these conditions met, squid won't spawn!  There must be something wrong that won't allow them to spawn!  We have tried a lot of troubleshooting and nothing works!  Thanks!

Please read here:

(I tested making the entire area water source blocks, and I had 2 groups of Salmon spawn while building it, but after that no more salmon spawned, and zero squid have spawned!) 

The purpose of this farm was to have an ample resource of Ink Sacks, because hunting them in the ocean is way too scarce!  We used sources like wikipedia and youtube to confirm where/how they spawn!  Assuming any of those are correct, the first farm should be spawning squid (made of tall flowing-water columns).  But the second variation using an entire cube of water source blocks, that isn't spawning any squid either!  There must be something wrong with the game!  I hope they fix it soon because we need A LOT of ink sacks!