Adv. gamemode issue in the end!

The breakable blocks in adventure mode change in the end
(glowstone, glass,...)

What I expected to happen was...:
When I try to break glass, it instantly break, like in the overworld.

What actually happened was...:
It takes the same time than in survival mode, and shows the animation of breaking.

Steps to Reproduce:
1. Go in the end
2. Place a glass block in survival or creative
3. Break it in adventure mode