It seems that with the new 1.8 snapshots, when creating a new world in that version, there're are not spawning any chest in dugeons or spawner rooms. I've tested this by loading a world in a couple version of the 1.8 snapshots and creating exacly the same world in 1.7.
The worlds which were created in the 1.8 snapshots never had any chests in the spawner rooms, while worlds created in 1.7 did.
MC-47307
No treasure chests in Spawner Rooms
Resolved
Duplicate
0
Duplicate of MC-45773 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.