I have created an html block on the main page of our site. I set it to be visible throughout site. I then navigate to a course and reconfigure so that it only displays on all course main pages. After a few days, (never the same and not predictable) the block disappears. I have asked the other moodle admins if they have removed it from a course or something but no one has responded. I attempted to login as a teacher to verify if a teacher can disable - remove - delete this block. As expected, it cannot be removed but simply hidden within the course.
I have resorted to adding the ,link as a custom menu item to handle temporarily. I also tried on our development server - which is running the same version as our production server but to no avail. The block has not been removed. When I removed the block I verified in the moodle logs to see if I could find the action responsible in the logs but it does not appear to be tracked.
We are running moodle 3.9.3+ scheduled for update shortly to 3.9.4.
Does anyone have any advice?