Use interact button instead of action buttons to pick up object.

characters/base/character.gd

@@ -184,6 +184,8 @@ var jump_impetus := false
 var action1_impetus := false
 ## Whether the character is "trying" to perform their secondary action.
 var action2_impetus := false
+## Whether the character is "trying" to perform a tertiary interaction.
+var interact_impetus := false
 ## Collision shape height.
 var height: float:
 	get():
@@ -1242,7 +1244,7 @@ func _on_idle_while_holding_state_tick(delta: float) -> void:
 		force_change_state(&'jump-while-holding')
 	elif !impetus.is_zero_approx():
 		state = &'walk-while-holding'
-	elif action1_impetus || action2_impetus:
+	elif action1_impetus || action2_impetus || interact_impetus:
 		state = &'put-down'
 
 func _on_walk_while_holding_state_tick(delta: float) -> void:
@@ -1258,6 +1260,8 @@ func _on_walk_while_holding_state_tick(delta: float) -> void:
 		state = &'run-while-holding'
 	elif impetus.is_zero_approx() && top_speed_proximity < 0.03125:
 		state = &'idle-while-holding'
+	elif action1_impetus || action2_impetus || interact_impetus:
+		state = &'put-down'
 
 func _on_run_while_holding_state_tick(delta: float) -> void:
 	_do_standard_motion(delta)

characters/controllers/player_character_controller.gd

@@ -15,3 +15,4 @@ func _physics_process(_delta: float) -> void:
 	character.jump_impetus = Input.is_action_pressed(&'jump')
 	character.action1_impetus = Input.is_action_pressed(&'action1')
 	character.action2_impetus = Input.is_action_pressed(&'action2')
+	character.interact_impetus = Input.is_action_pressed(&'interact')

test/pick_up_item.gd

@@ -5,5 +5,5 @@ func _ready() -> void:
 
 func _on_body_entered(body: PhysicsBody3D) -> void:
 	if body is Character:
-		if body.action2_impetus:
+		if body.interact_impetus:
 			body.pick_up(self)