If you're curious, the reason this is happening is because I forgot to re-add a .a on a line at some point during testing. The original intent for the effect was, when it got dark, was this, with proper alpha sampling vs entire color sampling:
And I missed it because my test area was using white text. Whoops.
The method you posted uses Mix to completely strip the effect off of where the text is visible, using the original text's alpha value as the blending value. I had intended to come back to the pack for content update in a few months, which was going to include a hollow version of this one, as well as a mix version like the one you posted.
