Index: .arclint
===================================================================
--- .arclint
+++ .arclint
@@ -27,7 +27,8 @@
       "type": "eslint",
       "bin": ["eslint", "build\\arclint\\dummies\\eslint.bat", "build/arclint/dummies/eslint.php"],
       "include": "/\\.js$/",
-      "config": "build/arclint/configs/eslintrc.json"
+      "config": "build/arclint/configs/eslintrc.json",
+      "flags": ["--rulesdir=build/arclint/configs/eslintrules/"]
     },
     "cppcheck": {
       "type": "cppcheck",
Index: binaries/data/mods/public/simulation/components/Foundation.js
===================================================================
--- binaries/data/mods/public/simulation/components/Foundation.js
+++ binaries/data/mods/public/simulation/components/Foundation.js
@@ -511,7 +511,7 @@
 	// Initially hide the preview underground
 	let cmpPreviewPosition = Engine.QueryInterface(this.previewEntity, IID_Position);
 	let cmpFoundationPosition = Engine.QueryInterface(this.entity, IID_Position);
-	if (cmpPreviewPosition && cmpFoundationPosition)
+	if (cmpPreviewPosition && cmpFoundationPosition && cmpPreviewPosition.IsInWorld())
 	{
 		let rot = cmpFoundationPosition.GetRotation();
 		cmpPreviewPosition.SetYRotation(rot.y);
Index: binaries/data/mods/public/simulation/components/GarrisonHolder.js
===================================================================
--- binaries/data/mods/public/simulation/components/GarrisonHolder.js
+++ binaries/data/mods/public/simulation/components/GarrisonHolder.js
@@ -226,7 +226,7 @@
 
 		// If ejection is forced, we need to continue, so use center of the building
 		let cmpPosition = Engine.QueryInterface(this.entity, IID_Position);
-		pos = cmpPosition.GetPosition();
+		pos = cmpPosition.IsInWorld() ? cmpPosition.GetPosition() : null;
 	}
 	return pos;
 };
Index: binaries/data/mods/public/simulation/components/Garrisonable.js
===================================================================
--- binaries/data/mods/public/simulation/components/Garrisonable.js
+++ binaries/data/mods/public/simulation/components/Garrisonable.js
@@ -132,7 +132,7 @@
 	}
 
 	let cmpHolderPosition = Engine.QueryInterface(this.holder, IID_Position);
-	if (cmpHolderPosition)
+	if (cmpHolderPosition && cmpHolderPosition.IsInWorld())
 		cmpPosition.SetYRotation(cmpHolderPosition.GetPosition().horizAngleTo(pos));
 
 	let cmpUnitAI = Engine.QueryInterface(this.entity, IID_UnitAI);
Index: build/arclint/configs/eslintrc.json
===================================================================
--- build/arclint/configs/eslintrc.json
+++ build/arclint/configs/eslintrc.json
@@ -6,6 +6,7 @@
         "brace-rules"
     ],
     "rules": {
+        "no-in-world-check": 1,
         "no-caller": 1,
         "no-cond-assign": 1,
         "no-constant-condition": ["error", { "checkLoops": false }],
Index: build/arclint/configs/eslintrules/no-in-world-check.js
===================================================================
--- /dev/null
+++ build/arclint/configs/eslintrules/no-in-world-check.js
@@ -0,0 +1,50 @@
+/**
+ * @fileoverview Rule to check Mirage interface usage.
+ */
+
+"use strict";
+
+module.exports = {
+	"meta": {
+		"type": "suggestion",
+
+		"docs": {
+			"description": "disallow unnecessary semicolons",
+			"category": "Possible Errors",
+			"recommended": true,
+			"url": "https://eslint.org/docs/rules/no-extra-semi"
+		},
+		"fixable": "code",
+		"schema": [] // no options
+	},
+	"create": function(context) {
+		return {
+			"CallExpression[callee.property.name='QueryInterface']": function(node) {
+				// Find all usage of this variable.
+				if (node.arguments[0].name === "SYSTEM_ENTITY" ||
+					node.arguments[1].name !== "IID_Position")
+					return;
+				let variable = context.getDeclaredVariables(node.parent)[0];
+				if (!variable)
+					return;
+
+				let usages = variable.references.filter(x => x.identifier.parent.type === "MemberExpression");
+				if (!usages.length)
+					return;
+				let checkBefore = usages.findIndex(x => [
+					"GetPosition", "GetPosition2D",
+					"GetPreviousPosition", "GetPreviousPosition2D"
+				].indexOf(x.identifier.parent.property.name) !== -1);
+				if (checkBefore === -1)
+					return;
+				let checkAt = usages.findIndex(x => x.identifier.parent.property.name === "IsInWorld");
+				if (checkAt !== -1 && checkAt < checkBefore)
+					return;
+				context.report({
+					"node": usages[checkBefore].identifier,
+					"message": "Call to a position-related method without checking IsInWorld."
+				});
+			}
+		};
+	}
+};