For whatever reason, on my profile after the update, my custom match statistics have reverted to “0 games played / 0 games won.” The stats for skirmish and quickmatch have not reset and are as they should be, so this is only an issue with the stats for custom matches.
Furthermore, after playing a couple of custom matches, this “0 games played / 0 games won” remained unchanged. It was as if I had never played the post-patch matches, as they did not show up in the statistics for custom matches. Something appears to be very wonky at the moment with the stats for custom games.