by Leon Stringer.
Are the subfolders for the plugins in this list present in your site's source code folder?:
blocks/quiz_resultsquestion/format/examviewfilter/censor, and so on.
These plugins are from Moodle 3.11 and were removed in Moodle 4.0 so these subfolders should not be present in the source code folder for Moodle 4.3.