Summary: buttons for deactivating a trap won't work and the game won't count clearing the POI and/or position of zombies needed to kill.
Game Version: A21.1 b16 stable
OS/Version: Windows 10
CPU Model: Intel(R) Core(TM) i5-6400 CPU @ 2.70GHz (4 CPUs), ~2.7GHz
System Memory: 8192MB RAM
GPU Model and VRAM: NVIDIA GeForce GTX 950A
Screen Resolution: 1920x1080
Video Settings: Custom: middle object detalisation, others are low/off
Game mode: SP
Did you wipe old saves? No
Did you start a new game? Yes
Did you validate your files? No
Are you using any mods? No
EAC on or off? ON
Got a quest for clearing zombies from Shotgun Messiah Factory in Navezgane, and failed.
After a few days got this quest again and after reloading of POI almost all buttons for deactivating traps were inactive (the one active was for oven explosion).
When i cleared POI it wasn't counting as clear and wasn't showing the positions of remaining zombies.
I ran through whole POI multiple times (including towers and water pit) and could not find any, so i had to abandon the quest.
Link to Pastebin Output Log: it was a long session several days ago (files are 15-18MB, too huge for pastebin).
If needed i can put the on cloud and share.