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Summary:
Calling fontWithSize: method on a system font returned from systemFontOfSize:weight: returns a font which has a different font name (and weight) than the original one, unless the weight is Regular or Medium. This affects both iOS 8.2+ and iOS 9 beta 4.

Steps to Reproduce:
Reproducing on iOS 8.4:
1. Retrieve a system font of weight UIFontWeightLight and size 20. Returned font is ".HelveticaNeueInterface-Light".
2. Call fontWithSize on the returned font to retrieve the same font, but with size 25.

Expected Results:
fontWithSize returns a font ".HelveticaNeueInterface-Light" with size 25.

Actual Results:
fontWithSize returns a font ".HelveticaNeueInterface-Regular".

Version:
iOS 8.2 and newer, including iOS 9 beta 4

Notes:
To work around this issue, one can use this instead:
newFont = [UIFont fontWithDescriptor:font.fontDescriptor size:25];
where "font" is the original font and 25 is the new point size necessary.

Attached project contains a "testbed" of different system fonts passed through fontWithSize and through the workaround above. It shows that on both iOS 8.2+ and iOS 9 beta 4 (which has different system font families) fontWithSize works incorrectly with many system font weights, while the workaround works correctly for all weights.

Configuration:
Any hardware or simulator

Attachments:
'SystemLightFontDemo.zip' was successfully uploaded.