The current code gathers AppStream IDs by looking at the app's desktop name and then adding ".desktop" onto the end of this, reflecting a now-deprecated convention that every AppStream ID ought to end in ".desktop". This hasn't been true for a while and isn't correct today; let's use a more modern API that returns more correct results.
BUG: 458812 FIXED-IN: 5.24.7
cc @matthiask @apol