random mobs spawn even if there's light very annoying
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Also having this issue. I keep adding torches to rooms to stop mobs from spawning and they're still there.

Please provide a screenshot of the area where monsters are spawning unexpectedly. This ticket will be resolved "awaiting response" until updated. Also please note the following:
In previous versions of Minecraft, it was common for the cave monster cap to be filled by monsters hidden in small, inaccessible caves. The chance of this happening would increase as you spent time in an area, for example building a base or exploring and lighting the visible caves. With the new despawning system in 1.16, the hidden monsters are now able to despawn regularly, so new ones can spawn in other places. Monsters should now regularly respawn on full blocks in places you have already visited but have not fully lit.
Keep in mind that torches have a light level of 14, monsters spawn in in light level 7 and below, and spawning is based on the light level of the space just above the floor. You may find it helpful to temporarily turn off smooth lighting (in video settings) to see how the light levels change block by block. For more information on calculating light levels see the Minecraft wiki.

I have also noticed this problem on my server. It's not just mobs. Animals have also been spawning in doubles and triples. We've witnessed all types of mobs spawn in overworld in double and triple. We've also had issues with keeping mobs out of our base. Additionally, Creepers have come up to doors that are RIGHT NEXT to cats (which are also outdoors).

Updated the description. "Mobs" is short for "mobile entities" and includes monsters, animals, villagers, etc.
@@unknown Your picture shows that there is not enough light in the room to prevent monster spawns. The block with the left side of the creeper picture is at light level 7, and it looks like the other blocks in front of the furnaces are at level 6 or 7 at most.
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Some mobs spawn in groups by design. If you think that groups spawning all on one block is a problem you may vote for MCPE-66319. Cats not consistently scaring creepers is tracked at MCPE-38533.
This ticket will be resolved as a duplicate of MCPE-302.
Same for me. The amount of mobs spawning in my houses, mansion, and within fence lines is crazy now. Everything is lit up and there are no spawners nearby. Creepers keep blowing up my homes!