It was doing a "if I touch the game in this very specific manner
everything works" which will light up in very nice green colours but is
actually useless for preventing regressions.
When the playfield is shrunk with mods such as BarrelRoll, flashlight does not account for this, making it significantly easier to play. This makes it scale along with the playfield.
Basically the slider needs to be slightly longer for this test to
correctly fail in headless tests, in conjunction with the new slider
tail leniency.
This is due to headless tests running at a fixed frame interval, and
these timings being *tight*.