Many T's follow the client-led therapy approach, where they won't bring up a topic unless a client does first. So it could be a case of that. My current T does not follow that approach, which I appreciate, because I also sometimes avoid difficult topics. Could you just ask your T what their approach is with that? And say maybe you need help sometimes bringing up difficult topics?

ETA: I second what Nottrustin said about sometimes emailing in advance to bring up difficult topic. Even just something like "There's something I want to discuss but I'm afraid to bring it up--could you help me with that?" could work if you don't want to mention actual topic. And if your T doesn't allow email, maybe writing/printing something out and handing it to them at the start of session?