Can not run wayland applications under stardust

I built stardust-xr-server on Arch, started it with its own XDG_RUNTIME_DIR (otherwise my desktop becomes unusable), and tried to connect weston-terminal to it with WAYLAND_SOCKET=/tmp/stardust-xr-0/wayland-0 weston-terminal. Weston-terminal only outputs this:
failed to connect to Wayland display: Success
failed to create display: Success

Other wayland applications fail with the same or similar messages.
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