Http error 405 when commenting in mobile subdomain

Website on WordPress https://hi-tech.ua with a separate mobile theme on the subdomain https://m.hi-tech.ua. When the Mobile Redirect option is enabled in the Speed ​​section in Dashboard Cloudflare, an error occurs when you try to comment on a post on the https://m.hi-tech.ua subdomain
“http error 405”.
Comments in the main domain do not cause such an error, Everything works. If you disable the “Mobile Redirect” option, then comments work on both the subdomain and the main domain. That is, the problem is precisely in Cloudflare redirects. The “Mobile Redirect” option is required to auto-detect the user’s device. It is also necessary for comments to work in the subdomain as well. What to do to make friends “Mobile Redirect” and comments on a subdomain?

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