Hey Sarah,
My apologies for the delayed response! I have raised this with our product team and will get back to you as soon as I can regarding this behaviour 
Hey Sarah,
Thank you for your patience with me!
I’ve heard back from our team and they’ve requested for this situation to instead use the quick filters.
The updated People filters works for the quick person filter , but not the regular widget filters (advanced, etc). So for example in this case, I have Pam Beesley, a Guest, assigned to a subitem on one board. On the first screenshot I’m using the quick person filter, on the second I’m using the regular filters:
Please let me know if this helps!
Hi,
Thanks for responding. However, that view only provides one person at a time whereas we would like to view multiple people so we can see how work is split between a team. This is why I’m using the advanced filters.
Is there another fix that utilises the filters provided?
Thanks,
Sarah