while the bug is still present in Debian trixie, it can be fixed by linking (or copying) the file:
/etc/profile.d/apps-bin-path.sh
to
/etc/X11/Xsession.d/20snapd
PS: This is actually a method that flatpak package uses to make the flatpak-installed applications available in the graphical environment (having file /etc/X11/Xsession.d/20flatpak identical to /etc/profile.d/flatpak.sh).