Copy Pad from Bank D Problem

I have a problem to copy a pad from bank D. When I press and hold copy and select the pad, as soon as I change banks, the copy 2 will disappear only from bank D. From other banks, when I hit copy and then hit bank, the copy 2 remains, but from bank D, not. Any ideas?

I think it’s a bug. The sample seems to disappear into the ether when changing banks from D.