The rotation of elements in the Minecraft Block/Item format are limited to one axis at a time and increments of 22.5 degrees. Minecraft cannot load models with different rotations.
(To be more specific, the only allowed values are -45, -22.5, 0, 22.5 and 45. If you work in a Block/Item format project and rotate an element then Blockbench will adjust the size/rotation/position of your element so you won't hit a wall at -45 or 45 degrees)
sturdy iris
lethal crest