Raghavender Chavva - Monday, April 16, 2018 9:06 AM
Most likely because the active portion of the log was at the end of the file, and NOTHING may move log records around in a log file. At a later point, the log had looped around and the active portion was at the beginning of the file, meaning the empty space at the end could be trunctated.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability