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apk doesn't seem to fully be able to roll back from edge to stable in all cases, and worse, doesn't tell me why

apk doesn't seem to fully be able to roll back from edge to stable in all cases. I went from postmarketOS edge to stable by changing the repo sources and using sudo apk upgrade -a. Yet, I seem to be stuck with edge-only nettle with something still depending on it, not letting me remove it:

$ sudo apk del nettle
World updated, but the following packages are not removed due to:
  nettle: epiphany gnutls samba-libs libsmbclient vlc vlc-qt samba-util-libs
          libwbclient gnupg gpgme ffmpeg-libs ffmpeg-dev pipewire firefox mutter
          gnome-shell gnome-session phosh postmarketos-ui-phosh qt5-qtwebengine
          plasma-angelfish telegram-desktop vte3 kgx lxterminal glib-networking
          libsoup evolution-data-server folks calls chatty gnome-calendar rest
          gnome-online-accounts libgdata midori libgweather gnome-settings-daemon
          gnome-clocks libosinfo tracker-miners nautilus libtracker tracker
          webkit2gtk geocode-glib geoclue cups-libs gtk+3.0 libcanberra-gtk3 cheese
          gnome-disk-utility gnome-screenshot gnome-bluetooth-libs gnome-bluetooth
          network-manager-applet colord-gtk gcr ibus libnma libhandy gnome-desktop
          phoc squeekboard eog tepl gedit clutter-gtk caribou gtksourceview4 zenity
          gspell clutter clutter-gst libdazzle baobab vino gnome-autoar libpeas amtk
          gtk+2.0 adwaita-gtk2-theme gnome-themes-extra lightdm qt5-qtbase-x11 kcrash
          kio purpose plasma-framework kdeclarative kglobalaccel kxmlgui kbookmarks
          kservice kwallet kauth kconfigwidgets kiconthemes ktextwidgets
          qt5-qtdeclarative qt5-qtwayland postmarketos-ui-phosh-qt_tweaks qt5-qtbase
          kpackage kdbusaddons karchive kdoctools kwindowsystem knotifications
          qt5-qtsvg qt5-qtmultimedia qt5-qtspeech qt5-qtquickcontrols2 kirigami2
          kirigami2-libs kguiaddons qt5-qtx11extras kjobwidgets attica
          qt5-qtwebchannel kwidgetsaddons kcompletion polkit-qt-1 qt5-qtimageformats
          kconfig kactivities-libs quazip kcoreaddons solid-libs kitemviews kcodecs
          sonnet kwayland ki18n qt5-qtgraphicaleffects libdbusmenu-qt cups-pk-helper
          xorg-server-xwayland

OK: 2677 MiB in 792 packages

However, since nettle is edge-only, that could only happen if I still have another edge package installed which sudo apk upgrade -a should have fixed. Yet, sudo apk upgrade -a seems perfectly content with this situation:

$ sudo apk upgrade -a
OK: 2677 MiB in 792 packages

With those being the current repo sources:

$ cat /etc/apk/repositories 
http://postmarketos1.brixit.nl/postmarketos/v20.05
http://dl-cdn.alpinelinux.org/alpine/v3.12/main
http://dl-cdn.alpinelinux.org/alpine/v3.12/community

So I appear to be stuck in this state, with apk not even really telling me why even. This is somewhat unsatisfactory.

Is it possible to somehow list all packages that are currently without a source in the repo? (Since that would likely reveal what edge stuff I am unintentionally still stuck with)

Why does this not do anything?

$ sudo apk del --force-broken-world nettle
 World updated, but the following packages are not removed due to:
   nettle: epiphany gnutls samba-libs libsmbclient vlc vlc-qt samba-util-libs
           libwbclient gnupg gpgme ffmpeg-libs ffmpeg-dev pipewire firefox mutter
           gnome-shell gnome-session phosh postmarketos-ui-phosh qt5-qtwebengine
           plasma-angelfish telegram-desktop vte3 kgx lxterminal glib-networking
           libsoup evolution-data-server folks calls chatty gnome-calendar rest
           gnome-online-accounts libgdata midori libgweather gnome-settings-daemon
           gnome-clocks libosinfo tracker-miners nautilus libtracker tracker
           webkit2gtk geocode-glib geoclue cups-libs gtk+3.0 libcanberra-gtk3 cheese
           gnome-disk-utility gnome-screenshot gnome-bluetooth-libs gnome-bluetooth
           network-manager-applet colord-gtk gcr ibus libnma libhandy gnome-desktop
           phoc squeekboard eog tepl gedit clutter-gtk caribou gtksourceview4 zenity
           gspell clutter clutter-gst libdazzle baobab vino gnome-autoar libpeas amtk
           gtk+2.0 adwaita-gtk2-theme gnome-themes-extra lightdm qt5-qtbase-x11 kcrash
           kio purpose plasma-framework kdeclarative kglobalaccel kxmlgui kbookmarks
           kservice kwallet kauth kconfigwidgets kiconthemes ktextwidgets
           qt5-qtdeclarative qt5-qtwayland postmarketos-ui-phosh-qt_tweaks qt5-qtbase
           kpackage kdbusaddons karchive kdoctools kwindowsystem knotifications
           qt5-qtsvg qt5-qtmultimedia qt5-qtspeech qt5-qtquickcontrols2 kirigami2
           kirigami2-libs kguiaddons qt5-qtx11extras kjobwidgets attica
           qt5-qtwebchannel kwidgetsaddons kcompletion polkit-qt-1 qt5-qtimageformats
           kconfig kactivities-libs quazip kcoreaddons solid-libs kitemviews kcodecs
           sonnet kwayland ki18n qt5-qtgraphicaleffects libdbusmenu-qt cups-pk-helper
           xorg-server-xwayland

OK: 2677 MiB in 792 packages

Could sudo apk upgrade -a possibly be changed to hint at some out-of-repo packages still being in the system? Just as a heads up warning that in overall, the system might not be in a clean state. Like, no need to list them all if that is too verbose, but to have any sort of pointer at that to start with (e.g. by listing the number of out-of-repo packages at least) would be very helpful.
It seems like sudo apk upgrade -a potentially has a bug, since it feels like it should have resolved this entirely. However, it might be easier to investigate this once I know more about what is even the current state right now in my system

Edited Jul 31, 2020 by Ellie