I have a recurring series set up to pay monthly on the 30th. In both the app and web portal, it skips it for February instead of making it the 28th (or even the 1st of the following month).
This is the bill in question:
Here is a screenshot of the Bills & Income>Overview screen showing it doesn't appear:
And here are two shots of the Bills & Income calendar showing the charges doesn't appear on either the 28th or the 1st: