Bug TV shows posters not showing when using plex via upnp

When I use infuse with the plex server (on osx) via upnp, the infuse app doesn’t show the tv series poster unless I click to go into the tv series folder. Then it will start pulling down the metadata. If I then go back up a level to the all tv series ‘folder’ then the poster now appears as normal.
I would prefer to avoid having to do this for every single tv series I have to get them to work (and for any new ones I add).

Note this bug happens on appltv 4 and ios 9.3 (iphone, ipad).

(note tv series are stored in the usual way TV->The Walking Dead->Season 1->s01e01 )