Update button no longer works

I noticed this problem after the 3.29.1 and 3.29.2 updates: when I edit a course and click the Update button to save my changes, the button has no effect whatsoever.

This only occurs in LifterLMS related post types. If I edit a normal WordPress page the update button works as expected.

I rolled back to an earlier version of LifterLMS (3.28.3) and everything works as normal now. But I’m reporting this issue here to see if a solution can be found for future updates.

PS. This may or may not be related, but the Enroll button on the front end was also affected by the 3.29+ updates. Clicking on it refreshed the page, whereas clicking on the Update button had no effect.