Animated block entitiy

why does this not work
summon minecraft:block_display ~ ~1 ~ {block_state:{Name:"minecraft:command_block"},interpolation_duration:60,start_interpolation:0,transformation:[1f,0f,0f,-0.5f,0f,-0.4999999999999998f,-0.8660254037844387f,-0.5f,0f,0.8660254037844387f,-0.4999999999999998f,-0.5f,0f,0f,0f,1f]}