Confirm the route and the next episode
Identify whether you are casting from a phone or browser, or running an iview app directly on the television. Those routes can display the same programme on the same panel while using different playback software. Record the casting route before comparing its behaviour with the native television app.
Next check that another episode is actually available in the series. ABC defines autoplay around the next available episode. Reaching the end of the available collection is therefore different from autoplay failing halfway through a collection. Open the series page rather than assuming that the episode order from a previous broadcast still describes the current catalogue.
Apply the documented exception
ABC lists its website, mobile apps and several television app types as autoplay platforms, but separately excludes Chromecast. Turning the phone’s local autoplay preference on is not evidence that the cast session should acquire a feature excluded from that route.
If you want to continue immediately, select the next available episode yourself. If considering another viewing route, first check that iview currently supports the exact television or streaming-device app. A platform change can affect other controls, so compare the actual app rather than treating all ways of sending video to a screen as interchangeable.
Check local settings when using a supported app
For a native supported app, inspect that app’s autoplay preference. ABC says settings such as autoplay are local to the receiving device. A laptop preference does not necessarily configure the television app that somebody else has opened.
ABC’s help also describes a cancellation prompt near the end of an episode. Note whether you cancelled it, whether the next episode was listed and whether the session was cast or native. Those details distinguish an intentional stop, a catalogue boundary and a route limitation. Repeatedly reinstalling the app before establishing those facts can discard useful context without changing the documented Chromecast exception.