Please view these topics on Joomla! Forum they are regarding the metatags on Joomla which do not update.
Is there someone who can check the T3 blank template code, maybe something is not right somewhere.
I have this artcle: https://www.dolcevia.com/nl/italie-reizen/agriturismo/umbrie/654-locanda-del-gallo-perugia which has unique metadata in the content database but it's taking the metadata from default menu item which is wrong!
This is something that has been terrorizing me since I moved from http to https about a month ago however I do not know if this is related yet.
It is however a huge SEO nightmare.