Builder fails installing Gnome/47 SDK; Seemingly missing double slash character

[ndom91]

I'm trying to build my flatpak with flatpak/flatpak-github-actions/flatpak-builder@v6 and it is failing in this GHA job:

- name: Flatpak build
  uses: flatpak/flatpak-github-actions/flatpak-builder@v6
  with:
    bundle: com.gitbutler.app.flatpak
    manifest-path: crates/gitbutler-tauri/flatpak/manifest.flatpak.yml
    cache-key: flatpak-builder-${{ github.sha }}
    arch: ${{ matrix.arch }}

With the following error message:

Installing org.gnome.Sdk/47 from flathub
error: Nothing matches org.gnome.Sdk in remote flathub
Error installing deps: running `flatpak --system install -y --noninteractive flathub org.gnome.Sdk/47`: Child process exited with code 1

Specifically when trying to install the Gnome 47 SDK:

flatpak --system install -y --noninteractive flathub org.gnome.Sdk/47

Runnign this locally also does not work, it seems that the slash needs to be doubled up, i.e.

flatpak --system install -y --noninteractive flathub org.gnome.Sdk//47

[ndom91]

If I try to manually install it via

flatpak --system install -y --noninteractive flathub org.gnome.Sdk//47

It still attempts to run the broken command :/

[ndom91]

Same is true with the latest master version (flatpak/flatpak-github-actions/flatpak-builder@master) using this step:

- name: Flatpak build
  uses: flatpak/flatpak-github-actions/flatpak-builder@master
  with:
    bundle: com.gitbutler.app.flatpak
    manifest-path: crates/gitbutler-tauri/flatpak/manifest.flatpak.yml
    cache-key: flatpak-builder-${{ github.sha }}
    arch: ${{ matrix.arch }}