bed disappeared when placed on polished granite

bed disappeared when placed on polished granite

What I expected to happen was...:
i expected to be able to place a bed on polished granite 

What actually happened was...:
the bed vanished as soon as i placed it 

Steps to Reproduce:
1. make polished granite and a bed 
2. place 2 pieces of polished granite 
3. place a bed on the 2 blocks of polished granite