diff --git a/src/Psalm/Internal/Analyzer/Statements/Expression/Call/ClassTemplateParamCollector.php b/src/Psalm/Internal/Analyzer/Statements/Expression/Call/ClassTemplateParamCollector.php
index 27b4bc448..3620c1520 100644
--- a/src/Psalm/Internal/Analyzer/Statements/Expression/Call/ClassTemplateParamCollector.php
+++ b/src/Psalm/Internal/Analyzer/Statements/Expression/Call/ClassTemplateParamCollector.php
@@ -235,6 +235,7 @@ class ClassTemplateParamCollector
                 }
             } else {
                 if ($template_result !== null) {
+                    $type_extends_atomic = clone $type_extends_atomic;
                     $type_extends_atomic->replaceTemplateTypesWithArgTypes(
                         $template_result,
                         $codebase
diff --git a/tests/Template/ClassTemplateTest.php b/tests/Template/ClassTemplateTest.php
index ef1cda7ba..91c733e18 100644
--- a/tests/Template/ClassTemplateTest.php
+++ b/tests/Template/ClassTemplateTest.php
@@ -3764,6 +3764,40 @@ class ClassTemplateTest extends TestCase
                         }
                     }',
             ],
+            'complexTypes' => [
+                'code' => '<?php
+
+                /**
+                 * @template T
+                 */
+                class Future {
+                    /**
+                     * @param T $v
+                     */
+                    public function __construct(private $v) {}
+                    /** @return T */
+                    public function get() { return $this->v; }
+                }
+
+
+                /**
+                 * @template TTObject
+                 *
+                 * @extends Future<ArrayObject<int, TTObject>>
+                 */
+                class FutureB extends Future {
+                    /** @param TTObject $data */
+                    public function __construct($data) { parent::__construct(new ArrayObject([$data])); }
+                }
+
+                $a = new FutureB(123);
+
+                $r = $a->get();',
+                'assertions' => [
+                    '$a===' => 'FutureB<123>',
+                    '$r===' => 'ArrayObject<int, 123>'
+                ]
+            ]
         ];
     }