Since the recent update of our multisite installation to WordPress Version 6.4.3, the Knowledge theme and its parent theme Busyness are broken. Sites using the themes show a generic “There has been a critical error on this website” message. Moreover, the entire admin section of those pages are inaccessible, showing the same error message. For now the only solution is to delete both themes entirely. Reinstalling them does not solve the problem. Please help!