As of the 1.2.6 update, the spawn rate of hostile mobs in hard mode is laughable - it's like playing on easy. Please revert the spawn rate to it's previous level or introduce a new level of difficulty that allows mobs to spawn at the higher rate.
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I'm seeing this too. Especially in the End.

Yep. I'm in two realms, one survival hard and one survival normal, and mob spawning is way down in both. I loved the massive spawning of mobs that followed the Glitchy Together update in hard mode, because I didn't have to rely on our blaze grinder to get levels. Now it's back to boring blaze grinding.
Not to mention, I had to travel a crazy distance just to find two cows to start a farm in a new location. And it looks like I'll have to do the same for the other animals.

Same issue here on my realms. No animals spawning in. Minimal mobs at night (Maybe 2 zombies and a creeper) and the nether is a joke. It's like the most safest place in the game. 0 wither skeletons. Blazes only at spawners and the occasional pigment. Ghast are none exsitent. I would really like the mobs to spawn back in at normal rate because the people I have on my realms are disappearing due to no spawn rate and making the game boring.

I think this is related: MCPE-21856

With 1.2.8 passive mobs spawn rate and number is close to 0 during day light. Tested a new 1.2.8 map for more than 10 hours. Hostile mobs seem to spawn normally during night while passive mobs don't spawn at all in very large areas or the spawn is minimal (one single animal in a very large area of the map). Finding a cow is a hard as locating an ocelot in a rain forest.
For some reasons this issue seems to be present since the tragic Better Together idea. This regression renders Survival maps worthless to be played, it is a game breaker.

Please add affected versions 1.2.7 and 1.2.8. Hostile mob spawns are fewer and include despawning. Hard mode is very easy unless you wander into a chunk that was loaded in s working version of the game.

I tried hard mode too and noticed that it seems the same amount of mobs spawn as in easy mode (very little!). On to the wiki, https://minecraft.gamepedia.com/Difficulty it never mentions if hard mode increases spawn rates, just that any mode other than peaceful does spawn hostile mobs.. Difffculty does affect many other things like, in hard mode:
mobs have more chance of spawning with armour,
damage increases.
more chance of villagers turning into zombie villagers.
I agree it'd be good to have a mode spawning more hostile mobs, or just increasing their spawning overall. Game is not the same without them!
On my world I've decreased my simulation distance back to 4 as when it was larger it included my large animal farm area. Now I do get some hostile mobs spawning around my base and my base mob farm that drops into my base. Suggest people try changing the simulation distance to not include your farm area, or have your farms away from areas you want hostiles to spawn.

After writing above comment, found more interesting info on the wiki about mob spawning. https://minecraft.gamepedia.com/Spawn
It is great to know more now about how mobs are spawned in Bedrock Edition. There are mob caps that confirm my findings about having your farm away from where you want mobs to spawn.
The wiki confirms that there is a mob cap, "The global mob cap for natural spawns is set at 200 regardless of difficulty." That makes you think that difficulty won't matter, but apparently it does. Later, under 'pack spawning' says: "Picks a random number of mobs to spawn in the pack. Each mob can have its own min and max pack size, and the pack size can depend on difficulty". It doesn't go into detail about the pack sizes for each mob though.
It does explain the mob density caps as well that are checked and reduce the probability of hostiles being spawned. It is different, and there will be less mobs than on to Java probably to reduce load on tablet and phones unfortunately. π
Cleaning up old tickets: This ticket has not been updated recently (~1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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More likely a duplicate of MCPE-21856.

My farm wonβt even work
I'm playing on normal and have found all mob spawns incredibly scarce since this update too.