Great job, Oliver! I knew you would take up the challenge.😉
As an experiment I have fixed both SingleChoiceSet and Summary with your pull requests; I have upgraded both libraries by increasing their patch number. I have uploaded the saved contents to my Moodle local test site and I am pleased to report that now all is looking as expected as can be seen on the attached screenshots for Summary. All is left to do now is to wait patiently for H5P team to merge your PRs and release new versions of those 2 contents...

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