Not git, but yes, it did mess up the blame lines. Luckily most people don't care about the attribution on BUILD files. But I did get the occasional email for years afterward about "hey looks like you added this build target, can you explain it?" or just an automated tool deciding I was the last person who edited the file so I was a good reviewer for a future change. Those pings were a fun tour of directories I'd never heard of (but did edit). Been a few years since I got one of those.