Under what conditions do FFCs with the "Carryover" flag stop carrying over? The ideal behavior would be that, once Link hits a screen with a Carryover FFC, it stays with him the rest of the game (until he hits another screen with a different carryover flag on that FFC or perhaps a canceling flag).
When do FFCs stop Carrying Over?
It's either a screen flag that does it or an FFC flag that you turn on the FFC that's being carried over. I don't remember which though.
In that case, something is wrong. The Ice Beam relies on a carry-over FFC. It works fine for awhile, then it just.. stops. Not sure why.