Inconsistent spawner/trial spawner texture behavior

The pictures do it better justice than I can describe, but essentially placing a full block against either z-axis facing side of either spawner turns the incorrect face transparent.

Doing the same thing in the x and y axis does not result in the same behavior,

I tried this with mangrove roots as well since they also are partially transparent and redstone conductive like spawners and the behavior does not replicate.