Can't prevent automatic screen updates via EpdDeviceManager

[kabukky]

Here's what I do:

1. Create a simple WebView and point it to https://time.is/
2. Call EpdDeviceManager.setUpdateMode(webView, UpdateMode.None);

But the clock is still running and refreshing the screen constantly. How can I prevent this?
My guess is that the WebView calls a system drawing method that overrides the update mode. But I can't be sure.

[kabukky]

Any idea about this?