Scrolling problems: scrollbar shown when it configured not to show, can't use scroll-page command

Version info:

qutebrowser v3.7.0
Git commit:
Backend: QtWebEngine 6.11.1
based on Chromium 140.0.7339.225
with security patches up to 148.0.7778.96 (plus any distribution patches)
(source: api)
Qt: 6.11.1

CPython: 3.14.6
PyQt: 6.11.0

Does the bug happen if you start with --temp-basedir?:

No.

Description

Something weird going on in scrolling. First of all, here's my scrollbar config:

scrolling-bar: when-searching

If I open any page (https://qutebrowser.org/ for example), it displays a scrollbar. I've binded "d" key to scroll-page 0 0.5, but it doesn't work when the scrollbar is shown. If I reload the page, the scrollbar disappears and scrolling with "d" key works.

Tested that the same happens with scrolling-bar: never.