Darkroom / OS X: negative artifacting on some anti-aliased text e.g. PDF

[the-window-respecter]

OS X 10.12.2 / in Preview:

When Darkroom mode is enabled, anti-aliased text often appears "hollow" and unreadable. Reproducible with PDFs and certain websites. This PDF lets you reproduce this: https://www.ftb.ca.gov/forms/misc/1083.pdf

Evidence:

Normal PDF:

Same PDF with Darkroom enabled (text is hollow) :

Darkroom PDF - closeup: