"Next unread" broken in webview


The webview Alt + 3 is a quite nice feature, but "Next unread" is totally broken when used in the webview.
Expected behaviour: looks for next unread article in feed. If no more unread articles in feed, then possibly jump to next feed below with unread articles.
Actual behaviour: goes to next article in feed, even if the article has already been read. When reaches the bottom of the feed, gets stuck there, does not jump to another feed.
I am missing something? Is there a tweak to get it to work like expected behaviour?

Webview next unread: New problem introduced in 3.12

Previous problem that "next unread" does not skip read articles remains to be solved.
A new problem is that read items in the webview keep the blue font with the toggle read icon filled (should turn to grey font when read).