Some sites/apps are not loading

For the last few weeks I am experiencing on my iOS devices, that some sites or apps are not loading or stops loading after some time. This happens while other sites are loading fine.

There are no “blocked” events in the log while this occurs.
I am for example experiencing constant issues with,,,, Sites are either not loading or loading to an incomplete state.

It only happens while connected to the mobile data network and Cloudflare One at the same time and not while connected to wifi. If I disconnect from Cloudflare One, sites are loading again. Strange!? Something wrong with the carrier’s network ( or is it a Cloudflare thing?

I can reproduce this behaviour by disabling mobile data on the device and enable it again.
Tested on iOS version 17.4.1 and 17.5 RC.

Can anyone maybe suggest how to debug this further?