Exportable Text from course presentation doesn't download

I have a course presentation with some textfields for exportable text. I can export the text on virtually every plattform and browser, but not with Chrome, Edge or Firefox under ipadOS. When I click on the button at the end of the course the download doesn't start.

Tested working:

Android with Chrome, Edge, Firefox

Windows 10 with Chrome, Edge, Firefox

ipadOS Safari

 

Tested not working:

ipadOS: Edge, Chrome, Firefox

 

Content is hosted with the latest wordpress plugin using Wordpress 5.6.2. 

Link: schule.pechart.de/ue-nachhaltigkeit

Content types: