Luna Gao
@PMatthaei Good point. I never thought about this problem. Would you share some test code so that I can better understand how to help you solve this problem?
Which platform you are using? Android, iOS, or Web?
I'm not sure, is `FlagsCode.GB` the `United Kingdom flag` ?
published on pub.dev
 Argentina (ar), Peru (pe), Serbia (rs), Sri Lanka (lk), Haiti (ht), Grenada (gd) those has been fixed in 7.0.0, and it already published on pub.dev.
https://www.iban.com/country-codes
fixed in 7.0.0 version. 
错误提示：出错了。。。好像。。。断网了。。。:(
咦？我查查看···
@JaneCheng00 我这边没问题。尝试退出重新进入一次？ 可否提供更详细的系统版本、网络情况（是否使用vpn之类的）进行参考？