When a quiz is opened in the Workplace app, html code remains visible in the question text.
(See Attachments '1')
After checking the source code, there is nothing special to see.
(See Attachments '2')
Through the Moodle Workplace app on 4.0.X and higher the problem is reproducible, through the browser via your mobile it is not.
This also applies to Moodle LMS 4.x.
With Moodle Workplace 3.11, there is no problem with the Moodle Workplace app, even through the browser on my mobile.
Again, this is also true for Moodle LMS 3.x
(See Attachments '3')
It concerns all sites with Moodle workplace and Moodle LMS 4.0.x and higher.
(The names 1 and 2 of the images must be reversed)