diff --git a/src/Type/TypeCombinator.php b/src/Type/TypeCombinator.php
index 1c6b04d0d6..73d02dace7 100644
--- a/src/Type/TypeCombinator.php
+++ b/src/Type/TypeCombinator.php
@@ -1740,6 +1740,7 @@ public static function doIntersect(Type ...$types): Type
 		$hasOffsetValueTypeCount = 0;
 		$typesCount = count($types);
 		$typesNeedSorting = false;
+		$hasPropertyType = false;
 		for ($i = 0; $i < $typesCount; $i++) {
 			$type = $types[$i];
 
@@ -1747,6 +1748,10 @@ public static function doIntersect(Type ...$types): Type
 				$typesNeedSorting = true;
 			}
 
+			if ($type instanceof HasPropertyType) {
+				$hasPropertyType = true;
+			}
+
 			if ($type instanceof IntersectionType && !$type instanceof TemplateType) {
 				// transform A & (B & C) to A & B & C
 				array_splice($types, $i--, 1, $type->getTypes());
@@ -1785,6 +1790,41 @@ public static function doIntersect(Type ...$types): Type
 			});
 		}
 
+		// Resolve object-shape optional keys that a HasPropertyType asserts are present before the
+		// reduction loop below. In that loop the generic supertype dedup can drop a HasPropertyType
+		// as redundant against a dynamic-property class such as stdClass (which reports every
+		// property as present) before it is ever paired with the object shape. Which of the two
+		// fires first depends on the member order, so the collapse runs here, where order does not
+		// change the result of what is meant to be an order-independent value. Gated on the presence
+		// of a HasPropertyType so the common intersection pays only the flag check set above.
+		if ($hasPropertyType) {
+			for ($i = 0; $i < $typesCount; $i++) {
+				for ($j = $i + 1; $j < $typesCount; $j++) {
+					if (
+						$types[$i] instanceof ObjectShapeType
+						&& $types[$j] instanceof HasPropertyType
+						&& !$types[$i]->hasInstanceProperty($types[$j]->getPropertyName())->no()
+					) {
+						$types[$i] = $types[$i]->makePropertyRequired($types[$j]->getPropertyName());
+						array_splice($types, $j--, 1);
+						$typesCount--;
+						continue;
+					}
+
+					if (
+						$types[$j] instanceof ObjectShapeType
+						&& $types[$i] instanceof HasPropertyType
+						&& !$types[$j]->hasInstanceProperty($types[$i]->getPropertyName())->no()
+					) {
+						$types[$j] = $types[$j]->makePropertyRequired($types[$i]->getPropertyName());
+						array_splice($types, $i--, 1);
+						$typesCount--;
+						continue 2;
+					}
+				}
+			}
+		}
+
 		// transform IntegerType & ConstantIntegerType to ConstantIntegerType
 		// transform Child & Parent to Child
 		// transform Object & ~null to Object
@@ -1949,20 +1989,6 @@ public static function doIntersect(Type ...$types): Type
 						continue 2;
 					}
 
-					if ($types[$i] instanceof ObjectShapeType && $types[$j] instanceof HasPropertyType) {
-						$types[$i] = $types[$i]->makePropertyRequired($types[$j]->getPropertyName());
-						array_splice($types, $j--, 1);
-						$typesCount--;
-						continue;
-					}
-
-					if ($types[$j] instanceof ObjectShapeType && $types[$i] instanceof HasPropertyType) {
-						$types[$j] = $types[$j]->makePropertyRequired($types[$i]->getPropertyName());
-						array_splice($types, $i--, 1);
-						$typesCount--;
-						continue 2;
-					}
-
 					$constArrayIsI = $types[$i] instanceof ConstantArrayType && ($types[$j] instanceof ArrayType || $types[$j] instanceof ConstantArrayType);
 					$constArrayIsJ = $types[$j] instanceof ConstantArrayType && ($types[$i] instanceof ArrayType || $types[$i] instanceof ConstantArrayType);
 					if ($constArrayIsI || $constArrayIsJ) {
diff --git a/tests/PHPStan/Analyser/nsrt/bug-15047.php b/tests/PHPStan/Analyser/nsrt/bug-15047.php
new file mode 100644
index 0000000000..d4782336fd
--- /dev/null
+++ b/tests/PHPStan/Analyser/nsrt/bug-15047.php
@@ -0,0 +1,58 @@
+<?php declare(strict_types=1);
+
+namespace Bug15047;
+
+use stdClass;
+use function PHPStan\Testing\assertType;
+
+abstract class AbstractJsonRepresentation
+{
+
+	/**
+	 * @param stdClass $data
+	 */
+	abstract protected static function fromObjectInternal(stdClass $data): self;
+
+}
+
+final class MissalYearLimits extends AbstractJsonRepresentation
+{
+
+	private ?int $untilYear;
+
+	private function __construct(?int $untilYear)
+	{
+		$this->untilYear = $untilYear;
+	}
+
+	/**
+	 * @param stdClass&object{since_year:int,until_year?:int} $data
+	 */
+	protected static function fromObjectInternal(stdClass $data): self
+	{
+		assertType('object{since_year: int, until_year?: int}&stdClass', $data);
+		assertType('int|null', $data->until_year ?? null);
+		assertType('int', $data->since_year);
+
+		if (isset($data->until_year)) {
+			assertType('object{since_year: int, until_year: int}&stdClass', $data);
+			assertType('int', $data->until_year);
+		}
+
+		return new self($data->until_year ?? null);
+	}
+
+}
+
+/**
+ * The member order of the intersection must not change the result: whether the object shape or
+ * stdClass is written first, isset()/?? narrowing resolves the optional key to its declared type.
+ *
+ * @param stdClass&object{u?:int} $stdFirst
+ * @param object{u?:int}&stdClass $shapeFirst
+ */
+function orderIndependent($stdFirst, $shapeFirst): void
+{
+	assertType('int|null', $stdFirst->u ?? null);
+	assertType('int|null', $shapeFirst->u ?? null);
+}