I'm assuming that this has been addressed already, but I can't find anything that answers the question...

None of my captain's AoE heals seem to work in Big Battles (on soldiers / commanders), though person-specific heals work fine (e.g. "Words of Courage" works, "Rallying Cry" doesn't).
Is this by design, or is it a flaw?

If a flaw, any ETA on fixing it? I feel like my character is... significantly less useful than I'd like.