The piston now pulls the block back when it only has a one tick pulse, I don't now if this is a bug or a bug fix, but I always saw it as a feature and others did too. While it doesn't effect most of the Minecraft community, it affects almost the entirety of the red stone community. The reason why this is a problem is now it is much harder to do a t flip-flop and two way flying machines among others
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I believe this is intended. Just like quasi-connectivity, they decided not to implement such obvious bugs into bedrock version of redstone.

Thank you for your report!
We're actually already tracking this issue at MCPE-14851, so I will resolve and link this ticket as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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this is probably intended on bedrock edition