Apparently this last firmware no longer support mTouch functions that you can choose in previous versions. You can activate those by simply placing your finger, not pressing.
As you can see in the image in italian, there was a function called “Home key touch”, in which you can associate “close, back and back to launcher”. I found the function “back to launcher” very useful.
It’s the same in your phones or something gone wrong during the update to the last firmware?