Some voice notes are becoming transparent,

Could it be that they're forcibly, temporarily manifesting in their original locations to generate the voices of voice notes that were blown away by bombs? Naturally, scores aren't added, but the voices do play. I thought it was a bug, but it only happens when I use bombs. If I play with just Lane UP, they properly exist and scores are added. Also, I had the special boost 1st formation equipped, so it seems the voice notes ended up overlapping with the bomb. 1st pic: Bomb + Special Boost 1st 2nd pic: Bomb + Special Boost 2nd 3rd pic: Lane UP + Special Boost 1st It's like this. Wouldn't some kind of announcement be good~? I was so bothered that I spent my ticket points.