User session environment variables set by /usr/lib/systemd/user-environment-generators/60-flatpak are using root's home directory instead of the actual user's home.

Expected: XDG_DATA_DIRS contains /home/<user>/.local/share/flatpak/exports/share

Actual: XDG_DATA_DIRS contains /root/.local/share/flatpak/exports/share

The generator script /usr/lib/systemd/user-environment-generators/60-flatpak executes:
#!/usr/bin/sh
export GIO_USE_VFS=local
exec flatpak --print-updated-env

The flatpak --print-updated-env command is not receiving correct user session context and defaults to root's environment.

• Works as expected: systemd 252-65.el9
• Broken: systemd-252-67.el9

  Steps to Reproduce

  1. Install systemd 252-67
  2. Log in as a non-root user from GDM
  3. Check echo $XDG_DATA_DIRS
  4. Observe /root/.local/share/flatpak/exports/share instead of /home/<user>/.local/share/flatpak/exports/share