Cloudflare & charset=windows-1251 & GoogleBot

The issue that with enabled Cloudflare site that use:
Content-Type = text/html; charset=windows-1251
This site displayed for people correctly (tested on IE, Chrome, Firefox, Edge), but at same time for GoogleBot all Cyrillic chapter begin to be unreadable mess.
And problem only shows up after site will be reindexed. In Google search console Live-preview show website correctly - this unclean part and hardening find working fix.
For one site I somehow manage to fix this, but not for second one. So I was forced to disable Cloudflare proxy mode from domain to stay in Google search.
Have someone ideas how this can be fixed?

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