I am playing on a laptop(i7-9750h, 16660Ti, 32 GB ram, m.2 PCie 4 SSD), and I have bought the PE two times on Google play store and playing it on a Huawei P30 Pro(Android10) and Xiaomi 13T Pro(Android 14). Generally, my kids are playing together on them, in creativ, using LAN.

However, I am also playing with those accounts, simultaneously: I open my world on the laptop, and the two other account are connecting, and staying on a fix place:farming gunpowder and wither skulls in an automatic farm.

The main character is about 1000 blocks away from the gunpowder farm(2nd character) , and has a view distance of about 20 chunks (does not need more currently)

The 3rd character is in the nether.

The farms are working perfectly, if the main character goes by, but the mobs will not spawn, if he was left the area. But sometimes, it is working without him. Right after login.

I have tried to restart the game or use another network, but I was not able to find any rule, when it is working or not.

I have not find any rule about mob cap in this regard.