Two types of bug reports

First: When creating a synchronized playlist, the playlist is generated with fewer songs than the specified number. When checking the ranking feature under the same conditions as the playlist, it appears a fixed number of songs are excluded during playlist creation.

This bug has been occurring for several years, and because of it, I have not been using the synchronized playlist feature. Please let me know if there is a fix.

Second: There are bugs in the playback history for some songs.

Example: When playing Hoshino Gen's song "Star," stats.fm sometimes recorded it as a playback of "Sayonara." Also, playback history for songs from Kirayamisaka's album "kimi wo omotte iru" prior to February 18th is missing. These are the ones I've noticed, but there are probably other songs affected by bugs. This affects playlist creation, so I'd appreciate prompt attention.

Since it could be an issue on my device, I plan to re-import my Spotify data. When doing so, can I delete the existing data? Please tell me how.