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Ah, it looks like you are using a custom Site Reviews “pagination.php” template in your theme.
You will need to edit the template file in your theme:
/wp-content/<your-theme>/site-reviews/pagination.php
And remove the {{ loader }} tag.
Apologies, this should have been added to the Upgrade Guide but it seems I missed it.
Spot on! Thank you, I was able to identify and fix the problem. Thank you for your quick answer!