org.freedesktop.Platform.Icontheme.Adwaita//1.0 keeps coming back

System info:
Flatpak 1.12.7
Linux Mint Cinnamon 21.2

Every time I run flatpak update, I get a message

flatpak update
Looking for updates…
Info: (pinned) org.freedesktop.Platform.Icontheme.Adwaita//1.0 is end-of-life, with reason:
   The Icontheme extensions are not used anymore.

I have tried manually uninstalling org.freedesktop.Platform.Icontheme.Adwaita//1.0, but it keeps coming back when I run flatpak update.

Here’s what I have installed:

flatpak list --columns=ref
Ref
com.github.flxzt.rnote/x86_64/stable
com.github.paolostivanin.OTPClient/x86_64/stable
com.github.tchx84.Flatseal/x86_64/stable
com.obsproject.Studio/x86_64/stable
io.github.flattool.Warehouse/x86_64/stable
org.chromium.Chromium/x86_64/stable
org.chromium.Chromium.Codecs/x86_64/stable
org.freedesktop.Platform/x86_64/22.08
org.freedesktop.Platform/x86_64/23.08
org.freedesktop.Platform.GL.default/x86_64/22.08
org.freedesktop.Platform.GL.default/x86_64/22.08-extra
org.freedesktop.Platform.GL.default/x86_64/23.08
org.freedesktop.Platform.GL.default/x86_64/23.08-extra
org.freedesktop.Platform.VAAPI.Intel/x86_64/22.08
org.freedesktop.Platform.VAAPI.Intel/x86_64/23.08
org.freedesktop.Platform.openh264/x86_64/2.2.0
org.freedesktop.Sdk/x86_64/22.08
org.gnome.Epiphany/x86_64/stable
org.gnome.Platform/x86_64/44
org.gnome.Platform/x86_64/45
org.gtk.Gtk3theme.Adwaita-dark/x86_64/3.22
org.gtk.Gtk3theme.Mint-Y/x86_64/3.22
org.gtk.Gtk3theme.Mint-Y-Aqua/x86_64/3.22
org.kde.Platform/x86_64/5.15-22.08
org.kde.Platform/x86_64/5.15-23.08
org.kde.Platform/x86_64/6.5
org.kde.elisa/x86_64/stable
org.kde.haruna/x86_64/stable
org.kde.kcolorchooser/x86_64/stable
org.kde.okular/x86_64/stable
org.libreoffice.LibreOffice/x86_64/stable
org.mozilla.firefox/x86_64/stable
org.x.Warpinator/x86_64/stable

The output says it is pinned. Check with flatpak pin and remove with flatpak pin --remove

I unpinned and uninstalled it, but after restarting my computer it is installed and pinned again, and I have the same warning message as before.

Could be a flatpak bug [Bug]: flatpak update installs an EOL extension and then proposes to remove it · Issue #5177 · flatpak/flatpak · GitHub

The only thing from your list that is using that extension point is the KDE runtime although not exactly sure what exactly is causing it to be pulled in.

My suggestion is to unpin it, remove it and then mask that ref to block installation flatpak mask org.freedesktop.Platform.Icontheme.Adwaita//1.0, see flatpak-mask(1) - Linux manual page

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