Add an upgrade rule.

OpenRA.Mods.Common/UtilityCommands/UpgradeRules.cs

@@ -872,6 +872,10 @@ namespace OpenRA.Mods.Common.UtilityCommands
 					}
 				}
 
+				if (engineVersion < 201504277)
+					if (node.Key.StartsWith("WithRotor"))
+						node.Value.Nodes.RemoveAll(p => p.Key == "Id");
+
 				UpgradeActorRules(engineVersion, ref node.Value.Nodes, node, depth + 1);
 			}
 		}

mods/cnc/rules/aircraft.yaml

@@ -30,7 +30,6 @@ TRAN:
 		Sequence: rotor2
 		GroundSequence: slow-rotor2
 	WithRotor@SECONDARY:
-		Id: rotor_2
 		Offset: 597,0,85
 	Cargo:
 		Types: Infantry
@@ -231,7 +230,6 @@ TRAN.Husk:
 	WithRotor@PRIMARY:
 		Offset: -597,0,171
 	WithRotor@SECONDARY:
-		Id: rotor_2
 		Offset: 597,0,85
 	RenderUnit:
 		Image: tran

mods/ra/rules/aircraft.yaml

@@ -210,7 +210,6 @@ TRAN:
 		Sequence: rotor2
 		GroundSequence: slow-rotor2
 	WithRotor@SECONDARY:
-		Id: rotor_2
 		Offset: 597,0,213
 	Cargo:
 		Types: Infantry

mods/ra/rules/husks.yaml

@@ -94,7 +94,6 @@ TRAN.Husk:
 	WithRotor@PRIMARY:
 		Offset: -597,0,341
 	WithRotor@SECONDARY:
-		Id: rotor_2
 		Offset: 597,0,213
 	RevealsShroud:
 		Range: 12c0