WinLAME 2021 Release 1 here, I just converted some flacs to mp3. Some resulted mp3 files show wrong duration time in foobar2000 v2.0 x64, and in also Windows 10 File Explorer. Interestingly fb2k and file explorer show different wrong times. The mp3 file plays to the real end, though. The original flac file and an mp3 conversion attached here:
monty.zip