Tvheadend

I have an IPTV source limited to 1 stream, when I force a scan it'll start going through the sources. Now if I watch a channel the scan is of course interrupted to allow me to watch the channel, but once i stop watching it doesn't continue but all channels are stuck in pend. If I select 2, check the checkbox for pend and click ok the scan continues. I would expect it to automatically continue once it's possible.