After a bug report at restic/restic#4677, we've identified that it is caused by the zstd library at the SpeedBestCompression level. Compressing and decompressing it afterwards results in corrupted data. There is no data corruption at the default compression level. I've tested versions v1.17.4 (via restic using Go 1.21.6) and v1.17.5 (using Go 1.21.6).

minimized.txt (Minimized using the script from #875)

Sorry for only bringing bad news, and that just before the weekend 😞 .