The player can climb the scaffolding from west & north side without being inside them

Summary:
The player can climb the scaffolding without being inside them. This only works from two sides. (west/north)
This bug is related to MCPE-131005.

Steps to reproduce:

1. Place scaffolding.
2. Place a block above the scaffolding.
3. Try to climb from different sides, coming close to the side.

Observed results:
You can climb on the west and north side of the scaffolding without being inside of it.

Expected results:
You shouldn't climb on them from either side outside the scaffolding.

Video:
https://youtu.be/ZT2e7iElGCE

Image: