proximity_fetch misses single entity, starts showing up when another is added

What steps will reproduce the problem?
1. do a proximity fetch
for: an entity with location (45.0616794,-83.4327528)
from center (42.270872, -83.726329)

What is the expected output? What do you see instead?

no results even with radius set to 0, or something very high (the two points 
are ~200km apart)

What version of the product are you using? On what operating system?
top of tree r22. mac osx

This was reproduced using nosetests with app engine integration.

One thing that is interesting is that adding another point for that entity 
makes it so both show up; the bug only seems to be in place when the 
point is the only entity in the datastore

Please provide any additional information below.

Original issue reported on code.google.com by kros...@gmail.com on 11 Feb 2010 at 1:13

metteo / geomodel

proximity_fetch misses single entity, starts showing up when another is added #15