Unable to GET all JS and CSS in Wordpress backend


I have a strange problem suddenly that all my wordpress admin backend resources cannot be loaded if I switch on Cloudflare, making it impossible to enter backend. I did not make changes to anything. It just… happened.

Front-end is relatively fine: only missing a few images.

I have whitelisted all Cloudflare IPs in CSF and also used wordfence Cloudflare-IP. And have been fine for a few weeks using CF without changing anything.

Any help is appreciated

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