You know how when someone changes album art or tags on an album after uploading/downloading it, and is the only 'seeder' left on the torrent, you will end up with a 95-99.9% complete torrent? This is because the metadata has been changed and doesn't perfectly match the original torrent.
I'm wondering if when a piece perpetual fails its hash check in this way, could you be missing any data of the tracks themselves, or will you only lose the original meta-data. If so, I'm pretty sure you will not get the altered meta-data instead (right?). I've always wondered if I should delete these torrents because the songs are gonna be missing data, or if it's no biggie and I'm only missing some tags. I don't really know that much about the inner workings of torrents and hopefully someone else here does and can clarify this.