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 vụ & sản phẩm trực tuyến Vietcombank

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