Say for example a player starts their turn unconscious, and so cannot take actions, or move, or XYZ. However, there is some "at the start of a turn" effect that heals them for damage. Can the player still take their action and move and XYZ, or is this something granted to them (or denied to them) at the beginning of the turn?
Another example would be, a player that can't take actions moves over to something that removes that inability (perhaps a spell that was inhibiting them but then they move into an anti-magic field). Can they now take their action?
Another example would be, a player that can't take actions moves over to something that removes that inability (perhaps a spell that was inhibiting them but then they move into an anti-magic field). Can they now take their action?