Here's an example of how it's "fixed" from YouTube:
What the video is showing is normal POI development. That's just how you use the Prefab Editor. In the Prefab Editor you build above the ground level plane and when you're done you set the ground level to where it is supposed to be. I can assure you TFP and established community developers know how to do this correctly.
the small town diner and parking lot
I'd love to have an actual POI filename or even the localized name from the Danger Meter. I hate to trouble you for those details, but there can be more than one POI to meet that description and I'd rather not guess, but...
- diner_01 - The Greasy Spoon
- diner_02 - Bob's Cafe
- diner_03 - Del's Cafe
- diner_04 - D-ick's Diner (It's funny that the forum moderated that name.)
- diner_07 - Navezgane Falls Diner
(FYI, diner_05 and diner_06 do not exist.)
diner_01, diner_02, and diner_03 are all ground level POIs.
diner_04 is elevated on a foundation one block tall. You have to go up one block worth of steps to get to the ground floor.
diner_07 is a ground level truck stop.
- downtown_parking_lot - Dowtown Evacuation Point
- parking_lot_01 - Park-n-Pay
- parking_lot_02 - Mobile Field Hospital
- parking_lot_03 - ParKing Lot
All of those are at ground level.
Are you perhaps referring to POIs in a modlet somewhere? Are you perhaps using a world builder other than RWG?
I kind of wonder if you're just making an observation that many POIs have intentionally elevated lawns and/or foundations, such that the first floor of the POI is not at ground level. That is, that you would go up a block's worth of steps to get to the "ground" floor...?
If so, that is often intentional. By doing so, zombie volumes don't have to be at ground level so people walking by the POI do not trigger the placement of zombies, which can have a momentary performance hit, plus those zombies would be unavailable to the server until they timed out.
I'm just trying to understand your perspective. At first it seemed like you were reporting a bug and now I'm wondering if you're expressing an opinion on POI design and aesthetics. I'm all ears and anxious to learn.