There are definitely some issues with files ending up with contents of other files, particularly with sparse files and nearly full disks, presumably due to new

There are definitely some issues with files ending up with contents of other files, particularly with sparse files and nearly full disks, presumably due to new allocations not being zeroed. Hard to replicate, but not impossible. We filed a bug and it was closed as a duplicate. Possibly fixed in todays 10.3.4 release, can't confirm yet.