Confirmed on IOS (iPad) S well.
Still occurs in IOS
It's getting worse, too.
Same problem in IOS.
That doesn't make sense: the same resource pack was working perfectly prior to the update. Has there been an update to the base block image files needed? (As found in the /textures folder)?
It appears to be just the corners of redstone... where two paths meet, cross, or turn a corner.
It also seems to only happen with the texture pack (a custom) I have installed. In vanilla, it works just fine.
So, if that means this isn't an issue for the current release, then just close this bug report - though I don't understand why the update should break the resource pack like this.
Confirmed on IOS (iPas) as well. Duplicate issue is from 2 months ago, which is pre release of version 1.2.