Fix AI Sleep Zones not working correctly since May
- race condition fix earlier this year inadvertently made any zone outside of a BaseEntity not initialise correctly (all except underwater labs)
- before / after on fresh procmap: https://files.facepunch.com/ryanw/2026/October/26_19-06-IndelibleBlackrhino.png / https://files.facepunch.com/ryanw/2026/October/26_18-54-FluffyDaddylonglegs.png