This isn't a bug as much as an issue with POI placement. I was playing solo and exploring a new power substation POI that happened to be right next to a trader, and (unknown to me) within the protected block radius.
While exploring, one section of the floor gave out, dropping my character into a pit with zombies. Normally, after killing the zombies, you'd be able to break blocks or frame-pillar back out, but because of the protected block status, I was unable to do place or break any blocks and became stuck in the pit.
While exploring, one section of the floor gave out, dropping my character into a pit with zombies. Normally, after killing the zombies, you'd be able to break blocks or frame-pillar back out, but because of the protected block status, I was unable to do place or break any blocks and became stuck in the pit.