Mine seems ok, maybe try a quick reset to see if that solves it for you? I do that after all updates.
I often notice this when i want to switch quickly to the camera app and i end up on the home screen. Now that u pointed it out to me it cannot be unseen. Argh
Does not happen on my 7Plus. Tried a dozen times.It's easy to reproduce and very annoying.
1. Double press to get into multitasking
2. Tap to Select an app
3. As soon as you're in that app try double-ckicling again and nothing happens.
There is a delay at least on my 7 Plus and iPad Pro.
If you have a bunch of apps open and select the wrong one from the switcher, or have to work between different apps and forget where you are, this is quite an inconvenience.I can reproduce this on my 6s as well, but only if you do it immediately. If you wait a second after opening the app using the app switcher then it works as normal. Not sure why you would want to immediately switch apps again without even looking at the app you just opened?