Buttons that don't highlight when focused:

• Cancel button in crafting cpus / crafting status
• all toggle Buttons in the Terminal settings and the visible types settings sub menus (they also lock focus so you can't focus anything else, but that is an unrelated issue)
• the + and - buttons in the priority sub menu and the select amount menu
• the Export Grid Button

Buttons that don't highlight when hovered:

• the crafting status and the priority button
• the back button in sub menus
• the recipe type selection buttons in the pattern encoding terminal (*)

Buttons that don't highlight at all:

• Store Items and take items in crafting terminal
• Clear, substitutions, fluid substitutions in pattern encoding terminal

(*) the currently selected type also doesn't get highlighted at all.
also the currently focused, but not selected button isn't distinguishable from the currently focused button, tho that isn't that much of a problem since one presumably knows in which tab one currently is