Again, some desync between mini player and actual song loaded can happen during rescan, but it should normalize itself as soon as scan finished. Desync happens due to the rapidly changing database, when some parts of PA may load different datasets, but this should be really rare case and only for the rescanning. An alternative is to disable UI or parts of it during rescans. If desync happens for you when no any active scan is happening (progress rotates in library header), please le me know.