FPlatformOutputDevices::GetAbsoluteLogFilename() not returning correct path when running multiple application instance

1 use FPlatformOutputDevices::GetAbsoluteLogFilename() in the game code.
2 UE_Log or print the return result of FPlatformOutputDevices::GetAbsoluteLogFilename();
3 package the game using development.
4 start multiple game process from the same excutable.

Result: In each game process started, the function, FPlatformOutputDevices::GetAbsoluteLogFilename(), will return to the same result equals to $GameName.log.

Expected: call function FPlatformOutputDevices::GetAbsoluteLogFilename() in each process, it should return different file names( $GameName_[INDEX].log)