pacman -Qdt

Hello everyone, when I check for orphaned packages with pacman -Qdt, I see packages that were previously set to be installed as explicit. Then I run pacman -D --asexplicit ..., check again with pacman -Qdt, and everything is fine—no orphaned packages. After a future pacman -Syu, reboot, pacman -Qdt I see the same packages again. This affects, for example: libreoffice-still-de, bluez-utils, alsa-tools, inkscape, linux-lts, ncdu, gnuradio-companion, xfce4-whiskermenu-plugin, firefox-i18n-de, discord, chromium. Any hints on what I might be missing? Has anyone had similar experiences? Best regards hias