Currently members search with last visit time involved yields incorrect results (or no results where it shouldn't be the case), also the related memberlist.php code (https://github.com/phpbb/phpbb/blob/3.2.x/phpBB/memberlist.php#L1076) is inconsistent with the similar  code of ACP prune users module (which works correctly https://github.com/phpbb/phpbb/blob/3.2.x/phpBB/includes/acp/acp_prune.php#L474-L486).