From f8c225c57655b9e00ed6db6435afda5dca5ad694 Mon Sep 17 00:00:00 2001
From: ging-dev <thanh1101dev@gmail.com>
Date: Sat, 30 Sep 2023 10:36:21 +0700
Subject: [PATCH 1/2] fix: #10239

---
 src/Psalm/Internal/Diff/FileStatementsDiffer.php | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/Psalm/Internal/Diff/FileStatementsDiffer.php b/src/Psalm/Internal/Diff/FileStatementsDiffer.php
index 797b6f73012..665cb47cafd 100644
--- a/src/Psalm/Internal/Diff/FileStatementsDiffer.php
+++ b/src/Psalm/Internal/Diff/FileStatementsDiffer.php
@@ -115,7 +115,11 @@ static function (
                         $b_code,
                     );
 
-                    $keep = [...$keep, ...$class_keep[0]];
+                    if ($diff_elem->old->getDocComment() === $diff_elem->new->getDocComment()) {
+                        $keep = [...$keep, ...$class_keep[0]];
+                    } else {
+                        $keep_signature = [...$keep_signature, ...$class_keep[0]];
+                    }
                     $keep_signature = [...$keep_signature, ...$class_keep[1]];
                     $add_or_delete = [...$add_or_delete, ...$class_keep[2]];
                     $diff_map = [...$diff_map, ...$class_keep[3]];

From c312c760503c4695331ee4893d0f81bce6f8e646 Mon Sep 17 00:00:00 2001
From: ging-dev <thanh1101dev@gmail.com>
Date: Sat, 30 Sep 2023 17:33:50 +0700
Subject: [PATCH 2/2] chore: add test

---
 tests/Cache/CacheTest.php | 49 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/tests/Cache/CacheTest.php b/tests/Cache/CacheTest.php
index 0efce1c6876..04f44eda644 100644
--- a/tests/Cache/CacheTest.php
+++ b/tests/Cache/CacheTest.php
@@ -199,5 +199,54 @@ class B {
                 ],
             ],
         ];
+
+        yield 'classDocblockChange' => [
+            [
+                [
+                    'files' => [
+                        '/src/A.php' => <<<'PHP'
+                            <?php
+
+                            /**
+                             * @template T
+                             */
+                            class A {
+                                /**
+                                 * @param T $baz
+                                 */
+                                public function foo($baz): void
+                                {
+                                }
+                            }
+                        PHP,
+                    ],
+                    'issues' => [],
+                ],
+                [
+                    'files' => [
+                        '/src/A.php' => <<<'PHP'
+                            <?php
+
+                            /**
+                             * @template K
+                             */
+                            class A {
+                                /**
+                                 * @param T $baz
+                                 */
+                                public function foo($baz): void
+                                {
+                                }
+                            }
+                        PHP,
+                    ],
+                    'issues' => [
+                        '/src/A.php' => [
+                            "UndefinedDocblockClass: Docblock-defined class, interface or enum named T does not exist",
+                        ],
+                    ],
+                ],
+            ],
+        ];
     }
 }