This is a bug thats new from previous versions.
Add Audio Track - the new dialogue box appears.
Choose an input - this will be something you’ve already setup from within Audio Connections.
On a Mono Track you’ll get a new Audio Input Connection called - Mono In 1 (The name of the Input Bus you’ve already set up), and it will actually appear in the Audio Inputs dialogue box replacing your chosen connection!
On a Stereo Track you don’t see this newly created connection instantly within the Add Audio Track dialogue box, but it is created within your Audio Connections and selected.
The Audio Connections are a bit of a ham fisted way of setting up connections as it is -
they are unwieldily to set up in a helpful order because you can’t change their positions once created.
if you are sending out to a console you need mono, ‘odd even’ and ‘even odd’ stereo busses setting up - so you end up with tons of buses to scroll through.
The Inspector’s name columns don’t show enough characters when you have to name all these damn buses.
This bug means you have even more connections being created, with names so long you’ve no chance of working out what they are in the Inspector.