PoK Door Wierdness

[tigurius]

I've been playing a couple weeks without issue, using PoK to travel mostly. Today I went to click on the 'Grobb' door, it didn't work. So I checked the doors table, strangely the dest_zone column for 'POKGROPORT500' was 'NONE'. I thought that was weird since it's been working for the past couple weeks fine, I've been zoning to Grobb quite often. So I even loaded up a backup of my old db from last week, it too shows 'NONE' for the Grobb door.

Changing the dest_zone to 'Innothule' fixed the problem but I'm curious, how was it working previously? Is there another way for doors to work? And what could have possibly happened to break it?

Thanks