Slime spawns incredibly limited/impossible

Slimes on Slimechunks only appear from height 6 to height 40, Any roof or if you have not left those layers free, no slime will appear

I have at least two platforms of three levels high above the first, giving them plenty of space to spawn. That is not the issue

Also, in the night slimes doesn't spawn

You're speculating here. I said I afk'd for multiple hours, which would allow the day and night cycle to occur many times. Please stop ignoring the information I originally commented with.

From the little I understand about slime spawning (and around a hour on gamepedia 😉) The slime for bedrock are not affected by seeds. Let me know if I’m wrong but I would say this is WAI (working as intended.) I recommend moving your farm to a swamp biome. Hope that helped!😃

This maybe related to one of the following issues: MCPE-47598, MCPE-45183, MCPE-44442, MCPE-40783.

If I am right @DrownedZombie is talking about issues that don't check conditions for mobs to spawn. I believe that's about right but might not be exactly the issue. Let me know if I am wrong though! 🙂

Sam
Please provide exact coordinates just northwest of each chunk you have dug up. Coordinate from the center of a chunk is more confusing and may be user error. IMO

I checked into the seed you provided. Are those chunks at the line of savanna and plain biomes with mountain and a ravine nearby?

I have slime chunk farm spawning properly and drop thousands slimeballs per hour in survival.

Edit: This could be user error or player lacks understanding spawn conditions of Bedrock version.
If the chunk is covered as not being exposed to the sky, that could be a problem as it counts toward cave spawn. Mob cap may have been filled before you completed building a farm. Cap is very low comparing to Java/Legacy which has plentiful cap and better despawn system.

If the farm is exposed to the sky, it should be decent enough during the day time. At night, it will be by chance as the game spawn all surface mobs count altogether in cap.

Lastly, if you did one or all of mentioned above. This may be an issue on Switch

Hi Eyeth,
The coords I provided in my first comment are read like this: southwest corner of the two chunks - northeast corner of the two chunks. Hope that helps. Yes my base is located in a savannah next to a ravine and very tall mountains.

Are you saying that in order to get my farm to work I have to either dig two chunks worth from Y-6 to the surface, OR light up every single cave in a certain radius, or both?? That seems like a huge amount of effort to just get a slime to spawn. Perhaps I should move my farm to a swamp biome instead?

Ty for the response. Yes, either for half operation or both for full operation. I recommend start off with digging a hole from y:39 to surface and see for yourself. Half operation is still decent enough for day light and be sure to light up the farm for night.

I see. Are you saying y:39 - surface in a swamp biome? Also how do you suggest finding all nearby caves to light up, and what is the radius around my farm I should be spawn proofing? I hear its tougher on Bedrock or the new update, something like that

No, I was referring to slime chunk anywhere. You can dig down to 39 in size of the chunk. No, don't light up the cave, just light up the chunk area AND with optional of light up simulation distance on surface. This one is easy.

Start off with that first and see how you feel about the drop rate. If you feel like going hardcore full operation would mean digging the whole simulation distance hole, light up cave and surface, OR filling the cave and spawn proofing surface.

EDIT: I forgot to add: you only need one spawning floor at y 39 to start with. After that, go stand and wait on the edge. Hope this helps

I see. It was my understanding that they only spawned UNDER y:40, but you're saying I should dig down TO 39. sounds easy enough. I'll try this and get back to you.

Yes, they do spawn from y 39 and below.

Wait, so putting platforms above y:39 won't spawn slimes then? This is confusing

Exactly. Only swamp biome allows slime spawn on surface of somewhere between y50 to 70ish.

I see. Sounds like I might need a beacon to get this done easier.

Just diamond pick with level 4 or 5 efficiency will do wonder or have people help. Dig layer to layer

I FOUND THE CULPRIT
Apparently there is an AI glitch with drowned zombies that causes them to congregate and attempt to attack any zombie villagers, but never actually harm them. So essentially there are just sections underwater with an ass ton of drowned orgies, I have came across quite a few that definitely filled up the mob cap. Not only was my slime farm completely dry, the game mode felt like it was on peaceful.
THE SOLUTION
I believe someone else suggested this but it works, either find and kill all of these clusters of drowned zombies (they won't even be bothered to attack you since they are locked on to the zombie villager), OR do a quick difficulty change to peaceful and back to hard. This in turn gets rid of all the drowned clusters and allows other mobs to spawn again (including the slimes in your farm). I tested this and immediately found my farm teeming again. There is just some weird AI bug that needs to be fixed, it's literally gamebreaking.

Eyeth is right, and I don't know about Luke's comment on Drowned targeting zombie villagers, but as far as drowned go MCPE-61721 is a major part of the problem.

If you want to make a slime farm from a slime chunk, I'd recommend doing so under the ocean, because nothing spawns in water-filled caves. There are very few dry caves under oceans that you have to spawn proof to preserve density cap room for the slimes.