Teams not linking to document library

When creating a new teams you also create an associated SharePoint site that serves as its document library. This library then gets linked under the files tab in the general channel. At least this is how it is supposed to be.
Lately however this does not seem to work correctly anymore The teams and general channel are created correctly, the SharePoint site is also create correctly. The files tab however does no longer link to the correct sub-site on our SharePoint but to the general site who obviously is not a document library, We are temporarily using the work around with creating a new tab and linking to the correct library but this is not a good solution in the long run. I've tested this on different devices, in app and in browser in anonymous browser windows to exclude any client side errors.

On the old teams who are working properly clicking on the files tabs send out a get request to the following url <organisation>.sharepoint.com/sites/<teamname>/_layouts/15/filebrowser.aspx?<querystring> 

On the newly created sited I am not longer getting a reference to which site it should go and we see a url like <organisation>.sharepoint.com/_layouts/15/filebrowser.aspx?<querystring>

This doesn't seem to be a fluke as we have tried it on different days, different machines with different accounts. The only thing we have in common is that the Teams admin role is managed trough PIM and has been requested just in time. 

Any help would be appreciated. The domain or root sharepoint have not been changed since it's creation many years ago