I also started experiencing this issue recently. I use Chrome to view my Comcast webmail. If I use Edge and Comcast webmail, I have no issues viewing all images. If I use Chrome and GMAIL, I have no issues viewing all images. After reviewing other recent posts on this issue in the community forum, it looks like it is specifically a problem with Chrome and Comcast webmail. Is there any way to bring this to Comcast's attention?
I think the only way to bring this to Comcast's attention is to call their help line. I will do that when I find the time and once I get an answer from them, I'll post it here. Unfortunately it takes some effort to get someone live at Comcast and then explain the issue. But, I'll try hopefully this coming week.