I could've sworn I had the new guide on then I updated the beta again and checked and said it was off. I, too, blame age. 
Or perhaps the update defaulted it to "off"?
It's not clear to me what the changes are between the old guide and the new experimental guide. Are we specifically addressing issues with the live TV channel guide? Or, are there also changes on other tabs like "Home", "On Now", "Up Next", "Movies", "TV Shows", etc?
It's just the live TV guide, and it basically makes it functional when it wasn't before.
@eric Since the last update...
This HAS NOT been fixed
When at the top of the guide, you should be able to arrow up or page up to take you to the bottom of the guide (scroll backwards). Otherwise you need to Page down a thousand times to get to the bottom of a large guide.
This HAS been fixed
If you are navigating around in the guide you should be able to press back and it will take you to the beginning of that current line, back again and it will take you to the top of the guide. As it is now it doesn't back up to the top, it exits the app!
I've confirmed that the current behavior in the Experimental Guide is consistent with the existing Guide on Android TV and Apple TV.
Latest update:
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Nope. Just sent you a DM to a video I uploaded to Youtube on it.
Thanks
That's weird, I'm looking at the ATV guide right now and when you press up arrow at the top it does not go to the bottom. Latest beta.
Doesn't here either. What if you are the top and you press Page Up?
Which device are you using?
I don't have a page up key I'm using a TiVo remote. It's an Apple TV 4K 2nd gen.
On my remote it's simply the Channel up/down button next to the Volume up/down button. It scrolls through pages at a time, not a single channel.
Wow, I could have sworn I tried using Chan up down before and it didn't work but it does now.
Anyway it doesn't wrap in my Apple guide with page up down. Hits the top and stops, hits the bottom and stops.
It wraps around on the OLD guide on Android TV boxes but not the experimental guide. At least not on the onn 4K plus boxes.
Agreed. Guide wrap around has always worked for me on Android (FireOS in my case), but never on my AppleTV boxes.
And that's a head scratcher. Yet another why does this act differently on different TV clients? Not mobile, TV with remotes.
noticed some issues today when trying to navigate the guide with several channels having multi-hour events. trying to go right on a 3+hr block nothing happens, but when multiple blocks are this way it's inevitable to push right a few times before going up or down to to a channel with shorter shows.
all the focus back and forth starts glitching and can lead to disappearing blocks. I took a pic with my phone.
it will gracefully recover if you give it a second or two and a navigation direction (no navigation presses left the screen as you see it in the picture.)
submitted diags.
I also noticed this earlier in the experimental guide versions, but didn't think much of it as there were bigger fish to fry, but I suppose it's possibly related.
the dropdown is not aligned with the channel column and overlaps the first time column.
@troyhough Yes, it was helpful to clarify that it was not up and down that wrapped. Only Page Up/Down.