Mushroom Back button and Webpage card using https issue

Hoping someone else can replicate this and determine whether it’s an intended security feature or a bug.

Functioning Back Button:
Add a new dashboard view as a Sidebar with a subview, then add a Back button using a Mushroom chip card. The Back button works as expected.

Break Back Button Functionality:
Now add a new Webpage card below the Back button. If the webpage is https, the Back button works. If the webpage is http, the Back button does not work.