Wrong MIME type served by CloudFlare

MIME type is wrong when Cloudflare serves CSS files as text/plain (should be “text/css”):

HTTP/2 403
date: Sat, 30 Jul 2022 04:45:10 GMT
content-type: text/plain; charset=UTF-8
server: Cloudflare

My site is NOT loading in browser because the CSS files MIME type, “text/html”, is not “text/css”

MIME type is correct when loaded directly via my server:

HTTP/2 200
server: nginx
date: Sat, 30 Jul 2022 04:45:58 GMT
content-type: text/css
host-header: 8441280b0c35cbc1147f8ba998a563a7

Can you please investigate/fix?
Thank you!

You’re not receiving CSS, you’re receiving a block/challenge page.

I fixed the problem by deleting the server cache about half an hour before your reply. Thanks for your time and effort.

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