Just for grins I submitted the question to Discovery Channel from their web page Contact Us form.
No reply (gave my email addr).
Doing a web search I saw one of the contestants on the show post something on Twitter or Facebook to watch the episodes on Fridays as Discovery had switched from Sundays to Fridays, replies to her were Huh, didn’t air and no more replies about it. Just another mystery.
Sounds like the show got cancelled =(
Hm, that's strange. When I tried it here it seems to work like I expect:
Does it only show the next airing (i.e. in your case the next Friday, tomorrow)?
Try using Wednesday.
Appears like it may have been cancelled, I can find the first 4 episodes I recorded available for on-demand and streaming, but nothing after those. Strange, since Discovery already bought the 8 episode series and it’s not a repeating series.
Checked the Discovery Channel website and it does appear that episode 5 (the one Channels DVR missed) aired, but no info on upcoming episodes.
Twitter feeds, including contestants on the show are saying the same thing.
I figured out why the Advanced Pass with Channel==CH# and Time CONTAINS Wednesday 10pm didn't appear to be working. Looks like when you set an Advanced Pass using Channel==CH#, it only retrieves the next 100 airings on that channel so in my case the 100th airing was Wednesday 7pm. A few hours later the 100th airing would have been Wednesday 10pm and it would have appeared in the Advanced Pass.
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Found out that Discovery decided to stop airing the series episodes after #4 and make the future episodes available exclusively on their Discovery GO website and APP’s according to one of the contestants.
https://twitter.com/herizondetails/status/1037532457812283393
One can only guess their reason for that 
I’ve fixed the latest DVR pre-release so it returns up to 500 upcoming matches, which should allow you to schedule and see episodes for atleast the next week with custom Time and other matchers.
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Thanks, hopefully that helps my other request here https://community.getchannels.com/t/what-shows-are-coming-up-this-week-on-ch/8887 for a channel specific view of what’s on this week for this channel#
i.e.
EPG grid view has horizontal time and vertical channels.
Click a channel on the far left column and then be able to drill down into vertical time columns for that selected channel.
So.... Is there a way to schedule a manual recording? Channel and duration of 8 hours is what I’m looking for.
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Manual recordings should be an option. There are numerous "hacks" (does anyone under 50 still use the word hack?) that could come in the future that would make this necessary, not to mention a few current situations.
Yeah, it's a normal word in my profession 
and in dev work.
Good to know ... good to know. Maybe tomorrow we could die-hard hack the gold depository at fort knox!
I like not being in jail thanks 
Did Bruce Willis ever end up in jail?
Possible Workaround (not hack)
This is a feature I'd like to see too especially now that TVE is a reality and has many channels that don't actually supply guide data. It would be handy to be able to specify a start time and a duration for a recording just based on channel.
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I would still like to see this implemented in Channels DVR.
Name the recording by whatever the guide says is on at the start time, or better yet, just name it
ManualRecording_CH# YYYY-MM-DD-Time.mpg (i.e. ManualRecording_750 2019-11-01-2030.mpg).
The ONLY reason I still keep my old TiVo Bolt (downgraded to TE3) running is in case my HDHR Prime bites the dust (and who knows if/when the PRIME 6 will be released). TheTiVo guide info is a joke as it always was with ROVI, but at least the TiVo allows you to set a manual recording.
Technically the DVR engine is capable of manual recordings. But we don't have a UI for it, because recordings and schedules without guide data and images are not well presented in the app.
If you really want to setup manual recordings, you can check the request made when you click a guide entry on the web UI and hit record and use that as a template with your own channel/time/duration and fake guide data. For the airing data, you can change Raw to null, and set Source to "manual" with whatever details you want for the Title/Image/Summary
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Can you explain this in more detail? For example, if one wanted to record channel 3.1 from 11:30pm until 12:00pm how would you manually do it?
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