Hi,
I have escalated this to the support@.. tier.
I will answer your questions here in case someone else gets in a similar situation:
Could it be that the classes are added by scripting that is being blocked by Cookiebot
Yes, I believe this is the case.
Automatic blocking of cookies relies on our solution successfully scanning your website. This is likely not being done if it’s a staging site unless you have had authentication for the scanner setup by Cookiebot.
Yes it is a staging site, but it lies in a subfolder of our original website. And I believe it has had all the needed authentication, successful cookie scans from the Cookiebot service.
I could provide you with a key to review the front-end, but not the back-end of our setup.
Hope that helps.