When I was attempting to bulk-invite a user, I noticed that every time I chose someone in the “Select” dropdown field, their username would not be populated in the box.
However, I’ve also noticed that even though it was not visually apparent the user was selected, if you were to then choose a status for them such as “Going” then press “Send invites”, the task would be completed normally.
The bulk invite UI has been broken for some time now. Previously, the drop down listing users failed to show the name of the user, and with the most recent update, the dropdown is completely gone.