[bug] Invisible iframe shown fullsize instead of main page

Maybe a rare corner case: I've build a webapp served over http (not https) which utilizes an invisible frame to enable websocket communication with another host (which is otherwise blocked by the browser).
With native alpha this invisible frame is displayed full size and I found no way to prevent this. On "normal" browsers the page behaves as expected. A web research revealed some hints that this is a "feature" of Android Web view, but that there may be means to circumvent this.

To give a bit more context: my use case is a static website hosted locally on a raspberry pi. On the client it pulls data over a web socket from my inverter to visualize solar power coming in so that I can turn on the washing machine at the right time ;)

Great app btw (y)