I don't know what happened after the update (AIO 1.11.14) but code-generated blocks seems to be down in the backend. I receive an error on all blocks ("this block encountered an error and can not be previewed"). they work on frontend, but not in the Gutenberg Editor.
I installed brand new WP, MB, MB AIO and only the code example to theme's functions.php to test:
Of course I created the dummy.php file (listed as the render_template) in the theme folder. It's pure html to prevent any errors but still nothing;
Blocks generated by builder seem to work.