Owners of Microsoft team are not granted access to associated SharePoint site

[LucidBike1140]

First, the SharePoint site was originally created as a team site and then later a Microsoft team was added to the site.  (Site was created before MS Teams existed.)  I have noticed that the Owners group for the team / M365 group does not exist in the SharePoint site's Owners group, therefore when someone is added as an owner to the team, they are not granted permissions to any of the files, stored in SharePoint.

Is there a way to re-add the M365 group owners as owners of the SharePoint site?  When attempting to select groups to add, I can only select the Members for the group.

[#2]

Hello!
Use the "Check permissions" in SharePoint permissions page, and enter the name of an owner that is not being granted and check, what result do you get?