Why resized images can be accepted via http?

just wondering why Cloudflare allow using HTTP instead of HTTPS for severing pictures? I use Always Use HTTPS and all request for main site give 301, but when I try to download picture via resizer I got 200
curl -i http://xxxxxx.xxxx/cdn-cgi/image/format=auto,quality=65/assets/087e1d89f390762914486709e4d278a4.png
HTTP/1.1 200 OK
Date: Sun, 08 May 2022 22:51:55 GMT
Content-Type: image/png
Content-Length: 2741
Connection: keep-alive
CF-Ray: 7085c34a6f9c6925-FRA
Accept-Ranges: bytes
Cache-Control: max-age=31536000
ETag: “cf6iybbfBZYZu-8ZBalpEdRA:6276a4e7-2320”
Last-Modified: Sat, 07 May 2022 16:57:11 GMT
Strict-Transport-Security: max-age=2592000; preload
Vary: Accept
CF-Cache-Status: HIT
cf-bgj: imgq:96,h2pri
cf-resized: internal=ok/h q=0 n=37 c=4 v=2022.4.12 l=2741
warning: cf-images 299 “Format ‘auto’ ignored”
x-content-type-options: nosniff
Report-To: {“endpoints”:[{“url”:“xxxxx://a.nel.Cloudflare.xxxx/report/v3?s=MZEszuHNwdgM4B9qoKtTFqFvxQJSsoihtGfe455EwFWUYLZu3j7fKFc9EL2nutJOQu1jPzCLEz2CCLh0Yj9iSC4qU3PQJ9ReGyxWJLMDgrxIzicSyzErAa1SboNOrtsMC8x92huwfUPzKOCA”}],“group”:“cf-nel”,“max_age”:604800}
NEL: {“success_fraction”:0,“report_to”:“cf-nel”,“max_age”:604800}
Server: Cloudflare
alt-svc: h3=":443"; ma=86400, h3-29=":443"; ma=86400

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