kreyren@dreamon /home/kreyren$ guix install --with-commit=flatpak=e084a4f14befc27d08094baba8cc8f714d7e417d flatpak
guix install: error: the source of flatpak@1.14.0 is not a Git reference
kreyren@dreamon /home/kreyren$ guix install flatpak@1.15.0
guix install: error: flatpak: package not found for version 1.15.0

Expected: To get the package flatpak@1.15.0 in the user profile in a non-painful way

-- Jacob "Kreyren" Hrbek