Base-extensions io.qt.qtwebengine.BaseApp.Debug fails to build on flathub infra

At https://github.com/flathub/com.collaboraoffice.Office/pull/2 “ Include base app .Debug in app .Debug" I want to add

  "base-extensions": [
    "io.qt.qtwebengine.BaseApp.Debug"
  ],

to a manifest, but the resulting flathub infra build failed at https://github.com/flathub-infra/vorarbeiter/actions/runs/20165674873/job/57888419433#step:17:118 with

error: Requested extension io.qt.qtwebengine.BaseApp.Debug/aarch64/6.10 not installed

It seems to be a bug in flatpak-builder. Can you open an issue?

I now filed https://github.com/flatpak/flatpak-builder/issues/697 “Base-extensions io.qt.qtwebengine.BaseApp.Debug fails to build on flathub infra” as requested