The sky reflections introduced in the deferred technical preview are applied to everything, regardless of block texture information. As demonstrated, the wood does not reflect point lights like the iron does yet it reflects the sun texture and skybox.

https://1drv.ms/v/c/8ebf7640b200833e/EbAMXU7QdG5IgxWb5bPLBKwBR4hElhA5TnjlCT0kyWVulQ?e=ROFZBF