In Adventure mode you can break some stuff like redstone, glowstonelamps, buttons, glass...
What I expected to happen was...:
That you can't destroy glass, redstone, glowstone...
What actually happened was...:
I destroyed it just like other people on my server (it's in singleplayer and in multiplayer)
Steps to Reproduce:
1. Make sure you can cheat.
2. Place glass
3. Typ /gamemode 2
4. Destroy the glass
Related issues
Comments

Duplicate of MC-3066 , please use the search function to see if your bug has already been submitted. Currently over 25% of tickets are being closed as duplicate.
Actually I think that is intented because some adventure map makers include in their maps some redstone puzzles and some kind of a vault of glass, i mean if you break the gate, you won't be able to close it again... There is no reason that the glowstone should be breakable in the adventure map though...