I somehow wrong warped from dying from Chica near the beginning and then warped me to 6am. I had no saves when doing this if you are wondering.

it would've been better if there was a footage

Here is the proof

did you play on a save that was on 6am before?

If you have a save that you previously reloaded, then clipping out of bounds and falling out of the map will send you back there. I assume it's the safeguard Steel Wool put in so people don't fall forever out of bounds, but you can still fall forever if you don't reload the save. If you end up wrong warping to a different save file, then I believe it counts as a NewGame+ run on the category extensions.

Something I failed to mention, this is also tied to dying. So say you have no saves, you start a new game, and die to Chica (as shown in the video) she will just spawn you in the void if you click retry

I did have an autosave at 6am. That might be it. I'm just curious if it's allowed.

For NG+ yes, regular run no