diff --git a/buildings/BuildingActionProvider.gd b/buildings/BuildingActionProvider.gd
index 1a9dba8..288f3fc 100644
--- a/buildings/BuildingActionProvider.gd
+++ b/buildings/BuildingActionProvider.gd
@@ -1,3 +1,5 @@
 extends Node
 
-@export var actions: PackedStringArray = []
+# Explicit empty PackedStringArray defaults are not export-safe for custom
+# scripted objects in Godot 4.7.1.
+@export var actions: PackedStringArray
diff --git a/buildings/BuildingDefinition.gd b/buildings/BuildingDefinition.gd
index ca4f598..118c776 100644
--- a/buildings/BuildingDefinition.gd
+++ b/buildings/BuildingDefinition.gd
@@ -18,7 +18,9 @@ extends Resource
 @export var action_icon: int
 @export var menu_icon: int
 @export var visual_scene: PackedScene
-@export var capabilities: PackedStringArray = []
+# No explicit empty default: Godot 4.7.1 can lose the value when exporting a
+# custom resource to binary .res.
+@export var capabilities: PackedStringArray
 @export var logistics: Resource
 @export var map_color: Color = Color.WHITE
 @export var map_sides: int = 4
diff --git a/buildings/BuildingLogisticsProfile.gd b/buildings/BuildingLogisticsProfile.gd
index fdd6706..e7100e0 100644
--- a/buildings/BuildingLogisticsProfile.gd
+++ b/buildings/BuildingLogisticsProfile.gd
@@ -6,7 +6,9 @@ extends Resource
 # converter does not require another resource-type branch in transport code.
 
 @export var input_buffers: Dictionary = {}
-@export var collected_outputs: PackedStringArray = []
+# See BuildingDefinition.capabilities: an explicit empty packed-array default
+# is not export-safe in Godot 4.7.1 custom resources.
+@export var collected_outputs: PackedStringArray
 @export var conversion_input: String = ""
 @export var conversion_output: String = ""
 @export var conversion_rate: float = 0.0
diff --git a/core/CatalogCheck.gd b/core/CatalogCheck.gd
index 5de9142..623a1cb 100644
--- a/core/CatalogCheck.gd
+++ b/core/CatalogCheck.gd
@@ -46,6 +46,7 @@ static func faults() -> PackedStringArray:
 	var found: PackedStringArray = PackedStringArray()
 	_check_vessels(found)
 	_check_buildings(found)
+	_check_planets(found)
 	return found
 
 
@@ -107,6 +108,12 @@ static func _check_buildings(found: PackedStringArray) -> void:
 		# rather than a thing standing in the world, and has no scene.
 		if definition.placement_mode == "space" and definition.visual_scene == null:
 			found.append("building %s stands in space with nothing to draw" % id)
+		if definition.visual_scene != null:
+			var visual: Node = definition.visual_scene.instantiate()
+			var provider: Node = visual.get_node_or_null("ActionProvider")
+			if provider != null and Array(provider.actions).is_empty():
+				found.append("building %s has an action provider with no actions" % id)
+			visual.free()
 		for field in ["menu_button_name", "menu_label_name", "menu_cost_name"]:
 			if str(definition.get(field)).strip_edges() == "":
 				found.append("building %s has no %s - the build menu could not place it" % [id, field])
@@ -127,3 +134,10 @@ static func _check_buildings(found: PackedStringArray) -> void:
 			found.append("building %s converts but lists no collected outputs - what it makes would never be fetched" % id)
 		if _list(logistics, "input_buffers").is_empty():
 			found.append("building %s converts with no input buffer" % id)
+
+
+static func _check_planets(found: PackedStringArray) -> void:
+	for definition in PlanetDefinitions.DEFINITIONS.values():
+		var id: String = String(definition.definition_id)
+		if definition.names.is_empty():
+			found.append("planet %s has no generated names" % id)
diff --git a/planets/PlanetDefinition.gd b/planets/PlanetDefinition.gd
index 6678109..faf5f64 100644
--- a/planets/PlanetDefinition.gd
+++ b/planets/PlanetDefinition.gd
@@ -3,7 +3,9 @@ extends Resource
 
 @export var definition_id: String = "rocky"
 @export var display_name: String = "Rocky planet"
-@export var names: PackedStringArray = []
+# Keep this implicit default export-safe; explicit empty PackedStringArray
+# defaults can replace authored values during Godot 4.7.1 binary conversion.
+@export var names: PackedStringArray
 @export var visual_scene: PackedScene
 @export var surface_profile_id: String = "rocky"
 @export var resource_id: String = "ore"
diff --git a/vessels/VesselDefinition.gd b/vessels/VesselDefinition.gd
index ba2a988..b6aad36 100644
--- a/vessels/VesselDefinition.gd
+++ b/vessels/VesselDefinition.gd
@@ -31,7 +31,9 @@ extends Resource
 # gun is the case that does.
 @export var garrison_ammo_resource: String = ""
 @export var garrison_ammo_capacity: int = 0
-@export var capabilities: PackedStringArray = []
+# Do not add an explicit `= []` default here. Godot 4.7.1 can discard a
+# PackedStringArray override while converting custom resources to binary .res.
+@export var capabilities: PackedStringArray
 @export var component_scenes: Array[PackedScene] = []
 @export var base_stats: Dictionary = {}
 @export var minimum_stats: Dictionary = {}