It was reported by users that HTTPS block in China was only for Wikipedia, thus the following change is proposed, given the current policy of having the best security while trying to keep access for logged-in users in China.
'wmgHTTPSBlacklistCountries' => array(
'default' => array(
'IR', // Iran
'wikipedia' => array(
'CN', // China 'IR', // Iran
T54846: HTTPS only Wikimedia problem for Iran Language related Wikipedias
T66207: Re-test https access fom China (PRC)