Working Orders keep working.

Work orders seem to keep working even if you swap the building, this is my trading post after I rebuilt it from a barn.

I swapped the trading post for a barn 1 week ago, then I swapped it back today I got this.

I could see swapping every building with work orders over and over to get a ton of stuff specially since profession stuff works at level 1 skill, once you get many scavengers and geared followers garrison resources are unlimited.