Recommended support gems for demon form don't work

I used vitality with demon form, but the shown life regen in "character" tab doesn't increase while in demon form.
It took 27 demon flare until I hit 1 life, when I support grim feast with vitality, it took 29, which should come from 1% life regen.
Same is true for clarity support

Recommended Support Gems seems to be wierd sometimes.
For Firestorm, which can't ignite, it recommends fire exposure, which only works on ignite.