Sticky pistons can pull a block 1 tick after pushing one

But the nature of the pressure-sensitive adhesive piston go put the signal is short the block is used in a lot of things ...

This only can be replaced by BUD block ...

I'm sorry to say this but your description of the bug is pretty hard to comprehend. Could you describe it in Japanese so that I can translate?
申し訳ないのですがあなたの説明はかなり解りにくいものです。私が代わりに翻訳するので、日本語で説明して頂けますか？

This issue works as intended. If you have a request for Minecraft Pocket Edition, please go to the Minecraft Forums -> MCPE: Suggestions.

The observer gives out a one tick pulse.

1ティックパルスの信号を粘着ピストンに与たら、PC版ならピストンがブロックを押してそのままブロックを引っ張らずに置いていくはずなんです
が、分かりにくいと思うので画像を貼って置きます
理想

https://mobile.twitter.com/iPhone6sUser/status/739294787132489728

実際

https://mobile.twitter.com/iPhone6sUser/status/739300727420387333

Okay thanks! I'll update the description.

僕の説明分かっていただきましたか？

Yes. I understood it. Thank you very much.
I updated the description and reopened the issue.
はい。良くわかりました。どうもありがとう。
説明欄を編集して reopen しました。

Confirmed in 0.15.0 / iOS.
In the screenshot shown below, there is a 1 tick on-pulse generator connected to a sticky piston. When it's triggered the piston should leave the wood without pulling it back but currently the piston does pull the wood.

The reason why I didn't use an observer block to generate the 1 tick pulse is that I wanted to ensure it wasn't the observer's fault.

I asked the developers about this issue. They said the "feature" in PC was intentionally removed from PE just like quasi-connectivity, because leaving a block behind on 1 redstone tick would require you to use repeaters everywhere, and destroy all normal builds.

But they added, If the community can find a unique goal which is impossible to achieve without the toggleable sticky piston, and that goal makes sense in the world of Minecraft, then they'll probably rethink about it.

So the conclusion is, this is currently an intended behavior of sticky pistons in MCPE, but things may change in the future.

P.S.
There is already a working 3x3 piston door built in MCPE 0.15.0. I was very surprised at it because I believed it was impossible without this behavior: https://youtu.be/XWbboYxqdZM

This is an unfortunate "working as intended". It significantly increases the difficulty and size of toggle switches, and causes unexpected behaviour when moving between versions.

I agree this is unfortunate. This exact inverse of this bug for the java edition was resolved as works as intended. The large majority of tutorials are for the java edition and won't translate to this new version. Finally our Xbox one console world, should you ever be able to successfully update it is going to be hosed.

"But they added, If the community can find a unique goal which is impossible to achieve without the toggleable sticky piston, and that goal makes sense in the world of Minecraft, then they'll probably rethink about it."

2-way flying machine contraptions are far harder (even impossible in many cases) to make without this feature. The fact that I can't use 1 sticky piston to push and pull the machine makes small 2-way flying machines difficult, and large ones impossible (without additional external contraptions that modify the flying machine to reverse the direction).