add 10686 test

Author: mvorisek

tests/PHPStan/Rules/Properties/TypesAssignedToPropertiesRuleTest.php

@@ -637,6 +637,11 @@ public function testGenericsInCallableInConstructor(): void
 		$this->analyse([__DIR__ . '/data/generics-in-callable-in-constructor.php'], []);
 	}
 
+	public function testBug10686(): void
+	{
+		$this->analyse([__DIR__ . '/data/bug-10686.php'], []);
+	}
+
 	public function testBug11275(): void
 	{
 		if (PHP_VERSION_ID < 80000) {

tests/PHPStan/Rules/Properties/data/bug-10686.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace Bug10686;
+
+class Model {}
+
+/**
+ * @template T of object|array<mixed>
+ */
+class WeakAnalysingMap
+{
+	/** @var list<T> */
+	public array $values = [];
+}
+
+class Reference
+{
+	/** @var WeakAnalysingMap<Model> */
+	private static WeakAnalysingMap $analysingTheirModelMap;
+
+	public function createAnalysingTheirModel(): Model
+	{
+		if ((self::$analysingTheirModelMap ?? null) === null) {
+			self::$analysingTheirModelMap = new WeakAnalysingMap();
+		}
+
+		$theirModel = new Model();
+
+		self::$analysingTheirModelMap->values[] = $theirModel;
+
+		return end(self::$analysingTheirModelMap->values);
+	}
+}