Using MakeMKV 1.51.1, I've created a decrypted backup and can rip from that backup to MKV as a TrueHD stream. But when attempting to rip from that backup with the FLAC profile, I get a few AV sync issues (at positions 0:00:40.707, 0:07:41.210 and 0:07:41.248) and then the rip fails. After demuxing the TrueHD track from the MKV file and attempting to transcode via ffmpeg, I get ~20 "Lossless check failed" warnings, which I suspect may have something to do with MakeMKV's inability to rip to FLAC.
Any help would be much appreciated!