Aquatic Creatures (anything that spawns in water) will not be able to spawn, if the bottom of the ocean is spawn proof. Meaning that by slabbing the ocean, you prevent all fish, squid, dolphin etc mobs from spawning in the water above.
This make sense for drowns, as they require the blocks to spawn on, so any spawn proofing would stop them from spawning. However fish, squid dolphins etc? Why should they check if the bottom of the ocean is spawn proof or not? They only need water to spawn.
How to reproduce:
1. Build a tank of water at world height, over an ocean biome. (aquatic things spawn at world height MCPE-44252)
2. Set up a repeating command to kill anything not around you, so things can spawn in your tank. `kill @e[type=!player,rm=30]`
3. Make the bottom of your tank out of stone, observe things spawning.
4. Place a layer of glass above the stone floor, kill everything in the tank, and nothing else will respawn.
5. You can replace that glass with slabs, pressure plates, signs, fences, anything you like that's not spawnable for aquatic things, and nothing will ever spawn in the tank.
This typically isn't an issue, until it comes to squid farms (see image below with fence gates below water). Having any form of water, with signs or fences below it, will never allow anything to spawn in the water. This breaks about 90% of squid farms and concepts immediately. This on top of all the other issues with squids and spawning, makes getting any amount of ink in a world very very tedious indeed.
For more info on this bug, and other issues with squids/aquatic creatures check out my recent bugrock of the week episode on this topic:
https://youtu.be/Qt7npxE9UzM
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Do you have a test world that you could provide that shows the issue? If so you might like to upload a copy of it for investigation.
On Windows 10 you can use the Export world feature.
On Android or iOS you need to use a file explorer to navigate to Device storage > games > com.mojang > minecraftWorlds
On Xbox or Switch the only way is to upload it to a Realm, and then download the world on Windows 10 or Android/iOS. (Please do not purchase a Realms subscription just to provide a world to us - but if you have a Realm already this may be a viable option if you wish to do so.)
If the world is larger than 10MB you can upload the world to OneDrive or a similar file sharing site, and then share the link.
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Being able to spawn proof water seems more like a feature than a bug. There are plenty of ways to make squid farms without using the gates method as you have proven silent. Personally I'd prefer this to remain as is.