Emby/plex cast to chromecast: where is my preview? (lovelace auto-gen)

Hello,

I’m running 2 different instances of hass on 2 different machines.
Both with lovelace in auto-gen mode

When I’m casting from my plex/emby media server to my chromecast,
I noticed that one of my instances shows a preview of the cast, the other not.

(1) card, showing ChromeCast is playing Emby (on both instances)
(2) card with preview (only on one instance)

I can’t find the trigger/setting for this behavior.
Can somebody point me in de right direction?

Many thanx,
Kind regards,
Bart