Hi!
Sorry for the delay, I was away for a while. You can always ask other community members when you need some assistance. They are very helpful! Currently, the capabilities with this releases includes subitems being filtered by person, status, due date, etc. I just tested on my account and it does seem to work when summarizing parent items! I also tried exporting on my account and it seems to work. Can you elaborate on what the issue is? If you think its a problem with your account you can also reach out to support. Feel free to send images or videos!