I tested this in 15w45a in singleplayer and experienced the issue, I couldn't open chests etc. As I was in singleplayer I couldn't test wether other players saw me as crouching or not.
Either way they should be classed as hostile mobs not as passive mobs.
Problem persists in Minecraft version 1.8.4 as well. This was tested on a Realms survival world.
KebabDavidsHos
I tested this in 15w45a in singleplayer and experienced the issue, I couldn't open chests etc. As I was in singleplayer I couldn't test wether other players saw me as crouching or not.