Lint Detector Does Not Detect Class Usages From Jar Files

Question

Given the following application structures:

Structure A:

-- App Root
    |
    |
    -- Android Module (class detector detects and usage in here)
    |
    |
    -- Custom Lint Module (detector defined here)

Structure B:

-- App Root
    |
    |
    -- Android Module (class usage in here)
    |
    |
    -- Jar Module (class detector detects in here)
    |
    |
    -- Custom Lint Module (detector defined here)

Structure A detects usages of some class X defined and used in the Android Module.

Structure B fails to detect usages of class X defined in the Jar Module and used in the Android Module.

Simply moving my class X to a Jar Module breaks lint detection. My detector is a modified version of this one from Jake Wharton.