Support Artillery research bug
It seems there's a little oversight on the PTE... one that regards about Support Artillery. You can place down a Support structure like Eye of Kane, Blade of Kane, etc. On the research tab, it hasn't been researched. This tidbit is what makes it strange. Normally you research something to unlock it, not unlock it before you research it. When I try to place it down, however, it fails. Normally you cannot click a unit that hasn't been researched.