Squids (and after further testing, all mobs now) no longer are affected by water currents like they were in 1.7.10 and before.

This means mobs are no longer affected by down flowing currents. To reproduce you just need to place a mob in water flowing directly downwards. NOTE: The mob must not be pushed out via sidewards flowing water.

https://www.youtube.com/watch?v=yducYP9Whmc
This squid farm and others alike worked in the before versions, however now they do not due to the squid being resistant to the water currents.
The squid look like they are bugging out as they swim in water currents, leading me to think this is not an intended feature.
This happens both in single player and also on a server I play (both in the snapshot)