Seems like when a teams manifest is uploaded and has a tab with a content url to SharePoint (i.e.
https://{teamSiteDomain}/_layouts/15/TeamsLogon.aspx?SPFX=true&dest=/). The pinned app appears to work and function normally, however when clicking the pinned app a second time, it gets a broken menu rendered:
The menu partially loads but breaks and leaves never ending shimmers. Any idea whats causing this? The manifest is fairly simple and straightforward, just showing a Modern Communications site.