Accessibility: Pop-up continue button not in focus after submitting answers in VO

Tested using the examples on the H5P webpage.

Expected: After correctly submitting the answer to a question, focus is moves to the feedback for the screen reader to announce it, afterwards, the next navigation forward moves to the "continue" button that has now appeared

Actual: After correctly submitting an answer, the focus indicator is shown on the feedback, though it is not announced. The next navigation forward from there then moves focus outside the pop-up. In order to press continue, you then need to navigate backwards one step into the pop-up again, which puts focus at the "continue" button