STEPS TO REPRODUCE 1. Run `flatpak --user install org.kde.Sdk` 2. select version >= 6.6 3. check `~/.local/share/flatpak/runtime/org.kde.Sdk/x86_64/*/*/files/manifest.json` OBSERVED RESULT file contains "inherit-sdk-extensions" : [ "org.freedesktop.Sdk.Extension" ], EXPECTED RESULT contains "inherit-sdk-extensions" : [ "org.freedesktop.Sdk.Extension", "org.freedesktop.Sdk.Compat.i386", "org.freedesktop.Sdk.Compat.i386.Debug" ], ADDITIONAL INFORMATION Version 6.5 still contains the expected extension When attempting to build an application with this in the manifest: sdk-extensions: - org.freedesktop.Sdk.Compat.i386 flatpak-builder fails with Error installing deps: Unknown extension 'org.freedesktop.Sdk.Compat.i386' in runtime