Mobs are spawning in well lit homes! They killed all my villagers! I've found zombies and skeletons inside homes that are very well lit. They've literally never spawned there before. I cured a bunch of villagers and had them in a fenced in, well lit, safe home, protected by an iron golem and found that all but one of them is dead. Please remedy this asap. I play on my Nintendo Switch.
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The first two pictures are of my home. Skeleton was found wandering on the other side of the fish tank. The third picture is of my daughters house. I've found zombie hordes in there 3 times now. The last 2 pics are my home for rehabilitated zombies. Zombies I've cured back into villagers and assigned jobs to. I've been building and playing in this world seed for years. I've Never had this happen. I'll try to get pics of it happening too.

Sorry, the pictures are now showing in reverse. The first 2 pics (the building at dusk and the room with the golden armor on the stand) are of my rehabilitated zombie home. They third pic is the home where zombie hordes have been found multiple times. The large house with vines growing near the door his followed by a pic of what's inside said door (the fish tank, living room pic).

Ok, I just added 2 more pics. There's a pic of my last villager that was alive who has now somehow turned back into a zombie and a pic of the small room he was in. There were no other mobs in the room. There was a zombie outside the window (behind and to the left of where I'm facing in the room pic) who I killed before taking the pics.

Ok, I got them. Added 2 more pics. Just happened to be walking buy as the sun was coming up and noticed 2 zombies inside my daughters house.

New picture uploaded. I hadn't seen any mobs spawning in my buildings for a while, so I started moving villagers back into my home I built for them. There's 9 torches lining the walls and a lantern on the table in this room (should be more than enough light, also never had this happen until recently). Looks like a skeleton somehow spawned in the room.

Uploaded 2 more pictures. 3 zombies and 2 skeletons spawned in my daughters house again. My daughters haven't actually played with me for a long time, so it's not like a door was left open. There is no other explanation other than mobs are spawning inside, where plenty of torches are.

I can confirm for 1.17 on windows 10 PC and PS4. I have major lit up large areas torches almost right next to each other and somehow, in multiple worlds, hordes of monsters are spawning and killing villagers and me. Idk what else to do. It started happening right after the 1.17 update. Everything was fine until then. I think there is something going on here. Just not sure exactly what.

Try to light up every single area, including the middle part. Could be related to MCPE-69037 as I also had mobs spawning in my base due to unusually dark spots. Incorrect lighting can happen if you travel from other dimensions, but it could also rarely happen simply from wandering around in the overworld.

From the attached pictures, it looks like the light levels are not high enough in the middle of the rooms. Torches are all at 3 blocks above the floor, so the light level in the block just above the floor straight below them is 12. From there, the light level will be 7 (low enough to spawn monsters) just 2 blocks to the side and 3 blocks in toward the center of the room.
It is easier to see light level changes for calculation if you turn off smooth lighting in settings. It may also be easier to see where the lower light is if you turn down the brightness or backlight on the TV.
Resolving as a duplicate of MCPE-302.
Please attach screenshots of the lit areas.