Black boxes instead of icons on Ubuntu 22.04

There seems to be something wrong with the Uuntu build of Nextcloud from the Nextcloud development PPA.

If I run it and open the main menu, many of the icons are shown as black boxes instead of actual icons. See my screenshot below.

I have also tried to build nextcloud/desktop from source code and ended up with the same result. But if I run the AppImage file instead, this bug doesn’t occur.

Is it something related to Ubuntu’s Qt version? Or is it some missing Qt plugin?

Nextcloud version: 3.10.1-20231026.170839.adf8fc77b-1.0~jammy1
Qt5 version is 5.15.3+dfsg-2ubuntu0.2
OS: Ubuntu 22.04 x64