Blackouts do not work as expected sometimes

[notpushkin]

During buildups I guess. Firefox:

Chromium:

Restarting (by pressing B) resolves the issue (the screen goes black as expected). Any ideas how to debug this?

[mon]

Is this only present when it's the first effect in the beatmap, or does it occur anywhere in the buildup?

[notpushkin]

Hm, for some reason it happens even without a blackout command; but it resets after any effect other than blackout. E. g.

....+...o.+.
^            here happens that weird background effect
    ^        this works like O
        ^    this removes the weird effect
          ^  this blackout does work as usual

Also, in the following setup:

Buildup
..+.+.+.....

Rhythm
................................
(something something)

after a a few beats of the loop (this seems rather random), a regular blackout happens and everything works as expected after that.

[mon]

This is now fixed and pushed as version 3.2