Where: When you go to the crossroads, there is a tree with a swing you can sit in.
When: When you sit in the swing, you can get up but you cannot leave the tree. You start phasing through it and an invisible wall stops you from leaving the surroundings of the swing. I sent a debug at 12:30 am 07/13/2021 UTC.
What: It traps you, just makes you unable to leave the area of the swing. Entirely powerless to leave. I haven't tried killing myself for obvious reasons...
Recreate: Do as described above. Sit in swing, leave the swing. Easy.
Ideas: None. Swing is cursed...