I've also been experiencing this issue with Apple News on all my devices (iMac, iPad, and iPhone) for the past several months; random lack of pictures, shortened article feeds, and a small message at the bottom of the screen stating that I'm not connected to the Internet. As with others, I knew that not to be true, as all other apps and pages responded and were active on the Internet.
What I did discover after some experimentation was that the culprit was being up on my VPN connection!! In every instance where the Apple News was broken, I simply de-coupled from the VPN and went back to my stock local ISP connection, the problem resolved. In EVERY instance, on EVERY device!!! Evidently Apple's developers have an accidental (or not) glitch in it's update to the News App that refuses to play nice with us trying to be secure in our daily operations.
I'm going to take a few hours of my time to contact Apple Support about this directly to ensure they get this in their bug list, but just thought y'all might want to check your settings to see if this is the cause of the problem on your systems. ArDitDit!