@Martin @Boris_Donkson @Naheed_Kausar
Partial Solution (I think):
it seems a CORS request related to the Publishing Date data field caused the entire blog collection to be blocked. I unfortunately don’t have the time to investigate the fix it recommends nor do I have any idea what it means. but I’m sure someone with technical expertise could probably advise on what that means.
FIX: in any case, it seems that simply deleting the publishing date field and removing any mentions, filters, or sorting related to it, sort of fixes the problem. The articles are being displayed however some buttons are still missing. Will update if I find their problem too.