Unable to connect to some domains when using CF Zero Trust DNS

Hello, I and some other people are having trouble connecting to some domains when using Cloudflare Zero Trust DNS with the "Enable EDNS client subnet" option, specifically with the following domains:

https://dangkydichvu.vietcombank.com.vn/
https://vcbdigibiz.vietcombank.com.vn/
https://vcbcashup.vietcombank.com.vn/

According to my research, the problem seems to occur when connecting from an IPv6 address, but IPv4 seems to be fine.
Cổng đăng ký dịch v& sản phẩm trực tuyến Vietcombank
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