EPG Program Icons?

I’m running the latest beta TVHeadend and Kodi 17 – with default Estuary theme.

I’m trying to figure out if it’s possible to get the program icons to show up? ie, when you select a show in the EPG, it would show a little thumbnail next to the description.

I’m getting my EPG via the SchedulesDirect JSON API, so I believe each programme should point to a thumbnail src.

Should I expect this to work? If yes, what am I missing?

I found this feature on the TVHeadend Issues board and it’s marked as complete, but it’s not working for me. https://tvheadend.org/issues/3108