The width of the chamfer is too large to recognize.
FeatureWorks has an upper limit on the width of a chamfer it recognizes.
Example
The upper limit that FeatureWorks recognizes for a square chamfer is 490*sqrt(2) meters.
A square chamfer is one with Angle 
set to 45°. For a square chamfer with Distance 
set to D:
W = D / sin(45°) = D*sqrt(2)
| Chamfer Width |
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|
W = Chamfer Width
D = Distance
A = Angle
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