情报来源：
https://www.macrumors.com/2019/10/07/apple-stops-signing-ios-13-1/
苹果今天停止认证 iOS 13.1
表示香港和澳门的居民将正式无法从表情键盘找到中华民国国旗了
https://boingboing.net/2019/10/07/apple-ios-13-1-2-for-hong-kong.html
Any iPhone purchased in China, or purchased elsewhere with the region set to
China mainland, replaces the flag of Taiwan with a missing character tofu (☒
) so it cannot be used or displayed in any app, even via copy and paste.
直接从中国购买的iPhone，或是购买地区设定为中国的iphone，台湾国旗直接被叉叉
取代，所以它不会被复制或是使用在其它的app上，甚至是被显示。基本上这个符号
完全不存在，也显示不出来。
In Hong Kong, this emoji still appears when present in a document or message,
and can be inserted via copy and paste with no change to the display. It also
remains an auto-suggest option when typing the phrase Taiwan.
在香港，这个符号是可以显示是文件和讯息中的，所以你还是可以复制、贴上。
当你打台湾的时候，它也会出现在自动建议
As for the most obvious place to find it - the emoji keyboard - that's where
this emoji has gone missing.
但是对于最明显可以找到的地方：表情键盘，台湾国旗不见了。
This new restriction applies to all iPhones purchased in Hong Kong, as well
as international iPhones where the region is set to Hong Kong.
这个限制适用于所有在香港卖的iphone。还有把地区设在香港的iphone