Hello,
I am also working with a lesson, in Moodle 3.4. My problem is that feedback shows html code.
Has anyone experienced same problem?
..
I didn't notice this one in 3.4 or 3.4.1, but am sure noticing it in 3.5.
The lesson module just doesn't seem to get enough testing in the release cycles.
I would suggest you add a bug in the tracker as this one is a show stopper. To make the feedback work correctly, you cannot have a hyperlink in the lesson page, which means disabling glossary auto-linking..... not ideal in a module designed to be an interactive learning tool.
I did some more snooping as I was experiencing this on our development server, but not our live server, both running Moodle 3.5.
In the end, it was the HTML Tidy filter that was causing the issue, although it is installed in both places. I clearly have some more snooping to do, but to troubleshoot the issue, disable all filters on a lesson, see if it works correctly, then selectively re-enable each filter one at a time.