The 'inventory file' dropdown on awx 17 doesn't let you enter a path other than /(project root)

I’m testing a very simple dynamic inventory project that syncs to a github repo. The repo contains two folders: collections and inventories. Under inventories, is the folder awx. In the awx folder, is the file aws_ec2.yml. The project itself syncs fine, cloning the github repo’s directory structure under /var/lib/awx/projects. The problem I’m running into, is when I try to configure the source for the project inventory in awx, the dropdown only lists ‘/(project root)’ as an option, and doesn’t let me enter the path to the aws_ec2.yml file below the project root.

awx version: 17.0.1
ansible version: 2.9.17

Known issue https://github.com/ansible/awx/issues/9043
For the moment it is better to stick with tag 15 of AWX for a usable interface.