It doesn't break 
and 
doesn't break stealth or when entering stealth.
I think this should be fixed.
Also, 
's Blades no longer make the damage sound unless he has vision of the target. This seems like more of an oversight than anythign, as every similar ability gives you the sound and Talon's W gave you the sound effect before the rework as well.
Girard1 votes[deleted]
ChaddyFantome1 votesIt's a channel, anything will break a channel.
This isn't true as stated n to OP tho.
MunchCrunchLunch1 votesIt's a channel, anything will break a channel. Wait until it finishes and then try and E.
no the item is not supposed to be broken out of combat mobility spells don't break it.
Narsicus1 votesA strict reading of the item would seem to imply that this is intended.
It states that it is a channel, but you can move during it. So running around is ok, but using an ability breaks channeling as usual.
The 'does not break stealth' does not really apply here as Talon's E has nothing to do with stealth.
Additionally Boots of Mobility do not apply here as they are only broken upon entering combat, and since using E does not bring you into combat it is only natural that you retain the move speed.
Now if using Talon's E broke the shield AFTER it had been channeled I could see that being an issue, but using abilities breaking the channel of Edge of Night seems to be the intended mechanics from how they are described on the item.