Bug - Normal Beat Box Special Move Pause

[FYH]

In the Fireworks Show PF, while Beat Box had no debuffs whatsoever, after cymbal clash is fully charged it stays gray. I didnt try pressing it so Im not sure if the color is the only issue or if there was a function issue as well. As you can see in the screenshot I have 3 cymbal clashes. They all fully charged, stayed gray for a few seconds, then had their color restored. Since there were no debuffs on Beat Box it could not have been done by a special move disable. There was also no lock symbol on the special moves. I am on an Oppo A5 2020, Android 9, color OS 6.