If Find the Hotspot is empty the content only shows a thin grey line. This is similar to the issue in this ticket: https://h5p.groovehq.com/tickets/66394
Issue is reported here: https://h5p.org/node/1005570
Test content: https://bv-demo.h5p.com/content/1291099902215799329
Attached is the error message in the browser console.
This issue also happens with Documentation tool and Memory Game.
Fixes suggested in:
(Image Hotspot Question),
(Memory Game), and
I’ll set this ticket to 'Improvement', because the changes have just been merged in the official master branches (and not to UX review as this is rather a technical issue).