If you read the FAQ I linked to above, you will see the distance from the hub is not the issue with lock status. You often need to add a beaming repeater close to the lock even for a lock which is already close to the hub.
20 feet from the wall switches is too far for this particular issue. The lock will choose one very close (10 feet or less) beaming repeater to act as its “answering service“. Again, this is all covered in the FAQ.
FAQ: why would I need another beaming repeater if my zwave lock is already close to my hub?
The benefit of this technology is that you get much longer lasting batterylife for the locks while also getting quick response time.
https://www.silabs.com/documents/public/white-papers/Z-Wave-FLiRS.pdf