"Add account" button under Online accounts appears to be the way to add an account, but isn't

Going to "Online accounts" in system settings, it appears that I need to click the large plus button next to the words "Add account..." to add an account. But that button does nothing, you have to click the list of account types underneath the dropdown that says "Show accounts that integrate with..."

It's a small bit of UI strangeness that only happens when you don't have any online accounts set up, but one that had me wondering if my trackpad has picked up my click for a while.