Clientbound play packet 0x0C (Boss Bar) using same byte for different booleans

Clientbound play packet 0x0C (Boss Bar) uses the same byte value ('2') for two different booleans.

private void setFlags(final int flags) {
        this.darkenSky = (flags & 1) > 0;
        this.playEndBossMusic = (flags & 2) > 0;
        this.createFog = (flags & 2) > 0;
    }

    private int getFlags() {
        int i = 0;
        if (this.darkenSky) {
            i |= 1;
        }
        if (this.playEndBossMusic) {
            i |= 2;
        }
        if (this.createFog) {
            i |= 2;
        }
        return i;
    }