After applying a translation transformation, left_rotation and right_rotation still applies relative to the block model origin instead of the block_display entity origin.

In the two photos below the following transform has been applied:

{left_rotation:{angle:0f,axis:[0.57735f,0.57735f,-0.57735f]},right_rotation:{angle:0f,axis:[0f,0f,1f]},scale:[1f,1f,1f],translation:[-0.5f,-0.5f,-0.5f]} 

with left_rotation's angle being updated in-between.