I have a git tag alias (git--tag-sortdate) which sorts by git tag date (most recent last).
It was printing 1.4.6 as the last line, which was confusing.
Looking into the issue, it appears that git tags after 1.4.6 have 1970 as timestamp, and are present at the top of the list.
$ git--tag-sortdate
1970-01-01 01:00 Updated change log
1970-01-01 01:00 Added to cdrskin standalone scripts a compile run for unite_html_b_line.c
1970-01-01 01:00 Committed forgotten header file
1970-01-01 01:00 Mentioned bug fix and pl01
1970-01-01 01:00 Updated change log
1970-01-01 01:00 Updated change log
2006-09-16 20:49 ZeroTwoTwo@145 Perfomed version leap in respect to SVN Thomas Schmitt
2006-09-20 14:42 ZeroTwoTwo@177 Fixed bug with dev=1,1,0 (ticket 75) Thomas Schmitt
2006-09-20 21:08 ZeroTwoTwo@386 Fixed Makefile.am Mario Danic
...
...
2015-05-17 21:36 1.4.0 libburn release 1.4.0 is ready Thomas Schmitt
2015-11-28 21:28 1.4.2 libburn release 1.4.2 is ready Thomas Schmitt
2016-01-29 11:44 1.4.2.pl01 libburn bugfix release 1.4.2.pl01 is ready Thomas Schmitt
2016-07-01 20:46 1.4.4 libburn release 1.4.4 is ready Thomas Schmitt
2016-09-16 20:20 1.4.6 libburn release 1.4.6 is ready Thomas Schmitt