Reproduce:
Open any project
click Edit members
Now add a new member in another tab
start writing that members username
What happens: member is not in the prefill list below the member input field
Expected: new member appears in the prefill list
This is probably because the member list is cached for the prefill.
this is a minor annoyance, but its already got 2 hits within the last few weeks and I dont have that much new members incoming in my projects