I do note from the plugin developer's support forum that the plugin may not play well with caches and so I've added an exclude to the Litespeed cache plugin (for the string '/sensory-types-quiz/') and purged the cache to ensure a clean slate. A further test of the quiz did cause the new quiz's results to be recorded in the dashboard.
Naturally excluding the quiz's URL from the cache does mean it'll load a little slower. If you find that an issue I'm afraid you would need to raise it with the Ari Stream Quiz plugin's developers.
Litespeed do offer a comprehensive API and so it should be feasible for the developers to configure the plugin to 'play nicely' with the Litespeed cache:
www.litespeedtech.com/support/wiki/doku.php/litespeed_wiki:cache:lscwp:api
You may like to draw the devs' attention to that URL.
Whilst looking into this issue I noticed that the PHP 'memory_limit' option was set to the default 128MB.
Since that is pretty low for a site running WooCommerce I amended that option to 512MB.
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With regard me asking if I could ask the quiz results being sent by email via the plugin, and support telling me to add my own email address and me explaining that I’d tried this but then no emails were sent he said this:
this is likely because you are adding your own address to the FROM address as it doesn't look like the plugin supports the ability of adding another recipient or CC currently.