When I tried to update the xfce template via Qubes updater, no error message appears and it looks like update happened and Updater still says that updates available for fedora-32-xfce.
Then I tried to update via Qubes Manager and there I got this message that those mentioned packages are not available. Main reason was qubes-artwork was not provided by anything and rest three depends on it, I think according to message.
Problem: package xfwm4-1000:4.14.2-1.fc32.x86-64 requires qubes-desktop-linux-common, but none of the providers can be installed. - package qubes-desktop-linux-common-4.1.2-1.fc32.noarch requires qubes-manager, but none of the providers can be installed. - cannot install best update candidate for package xfwm4-4.14.5-1.fc32.x86_64 - nothing provides qubes-artwork needed by qubes-manager-4.1.9-1.fc32.noarch (try to add '--skip-broken' to skip uninstallable packages) Done Press Enter to shutdown.