Thank you for sharing this question!
Although I'm not an expert in this field, let me understand your question first before forwarding it to our team for further investigation: if all zones (room) in this model is assigned to a thermal block, should the hole at the joint of T shape walls be covered?
Furthermore, could you share with us an example file where this issue is presented for a closer look? Let me know if you need a secure link to send the file also!
Looking forward to hearing from you!
Technical Support Engineer