You can see the Void from the large testroom - In the large test room, you can look out all the windows into the void, seeing doors and lights.
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Spoiler
=====================================================================Electrical Center not spawning in every seed - This one is obvious, and should've been fixed a long time ago. During my playthrough of 1.3.0, the Electrical Center (the one required to open Gate A and B) didn't spawn in my map. (The seed was "Vortal Combat", if you want to see)
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Notarget command broken - The Notarget command barely works. Whenever you walk (or couch) near an MTF with notarget on, no matter what they will, after a few seconds, turn towards you, then continue what they were doing. Most of the time, they will forget what they were doing, turning around and do something else entirely.
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Super Night Vision Goggles showing Lure Subject/SCP-106 above room - When using the Super Night Vision Goggles, upon entering SCP-106's containment chamber, the player will see the tag "HUMAN" and a meter count, and "SCP-106" with a meter count above the room. This isn't supposed to happen. This happens, since the Lure Subject and SCP-106 aren't actually in the containment cube, they are above the map (like most other events in this case). I don't know why this wasn't pinned down earlier.
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Spoiler
=====================================================================After reading SCP-1025 once, it doesn't randomize - After reading SCP-1025 once, you never stop reading the same page. The game doesn't randomize the pages. For example, I read "Asthma" first, and 1025 wouldn't stop taking me to the page "Asthma".
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Guards are faster than you in the intro - This wouldn't really classify as a bug, but it's still annoying. In the intro, Agent Ulgrin is faster than you. Which will cause the player to continually have to run for a second or two to catch up with him.
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Lure Subject falling through the femur breaker - As the title says. The subject can sometimes fall through the femur breaker.
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=====================================================================Grammar correction on badge - I don't know if this is right or not, but when looking at Emily Ross' badge, it says "Emily Ross's Badge" and not "Emily Ross' Badge". This doesn't classify as a "bug" really, but it's still something that should be looked at.
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Falling through 939's elevator - As the title says. Sometimes, when going to SCP-939's chamber, you may clip through the bottom of the elevator and die.
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Halloween command not working - After being used, the Halloween command won't stay, and SCP-173 will not say in his Jack-O-Lantern form.