Eversong Woods - Firework Launchers not doing firework

The four Firework Launchers (37.79, 71.53) (37.85, 71.71) (37.34, 72.47) (37.20, 72.44) should fire firework sometimes.

Here's a video that shows the firework - https://youtu.be/HVJu1jUwsvo?t=8m10s