MarsSeed [1] filed a deletion request for dds10-thumbnailer-kde-git [2]: Build with qt5-base, not qt6-base. KF5 (kio5) is still on Qt5. Also it seems depends=kdelibs4support is no longer needed.
[1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/dds10-thumbnailer-kde-git/
