Default Do someone also get this?

I just installed kitkat and like the others, battery drain happened to me. When I saw application list in setting I realize something unusual. Some application shows 0 bytes size! What do you think about it? Is it bug so Google play service also can't find some app or module in system 😛

And I also realize sometimes my light sensor doesn't work but after restart it sometimes working well again .

NB : I did clean install

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