diff --git a/ext/opcache/jit/zend_jit.c b/ext/opcache/jit/zend_jit.c
index 8c6934dfb6358..d969f744e6b4b 100644
--- a/ext/opcache/jit/zend_jit.c
+++ b/ext/opcache/jit/zend_jit.c
@@ -650,7 +650,11 @@ static zend_property_info* zend_get_known_property_info(const zend_op_array *op_
 		return info;
 	} else if (on_this) {
 		if (ce == info->ce) {
-			return info;
+			if (ce == op_array->scope) {
+				return info;
+			} else {
+				return NULL;
+			}
 		} else if ((info->flags & ZEND_ACC_PROTECTED)
 				&& instanceof_function_slow(ce, info->ce)) {
 			return info;
diff --git a/ext/opcache/tests/jit/gh12380.phpt b/ext/opcache/tests/jit/gh12380.phpt
new file mode 100644
index 0000000000000..75a0a9cc41824
--- /dev/null
+++ b/ext/opcache/tests/jit/gh12380.phpt
@@ -0,0 +1,62 @@
+--TEST--
+GH-12380: JIT+private array property access inside closure accesses private property in child class
+--INI--
+opcache.enable=1
+opcache.enable_cli=1
+opcache.file_update_protection=0
+opcache.jit_buffer_size=1M
+opcache.protect_memory=1
+opcache.jit=tracing
+opcache.jit_hot_loop=1
+opcache.jit_hot_func=1
+opcache.jit_hot_return=1
+opcache.jit_hot_side_exit=1
+--EXTENSIONS--
+opcache
+--FILE--
+<?php
+
+abstract class a
+{
+    private int $v = 1;
+
+    public function test(): void
+    {
+        var_dump($this->v);
+        (function (): void {
+            var_dump($this->v);
+        })();
+    }
+}
+
+final class b extends a {
+    private int $v = 0;
+}
+$a = new b;
+
+for ($i = 0; $i < 10; $i++) {
+    $a->test();
+}
+
+?>
+--EXPECT--
+int(1)
+int(1)
+int(1)
+int(1)
+int(1)
+int(1)
+int(1)
+int(1)
+int(1)
+int(1)
+int(1)
+int(1)
+int(1)
+int(1)
+int(1)
+int(1)
+int(1)
+int(1)
+int(1)
+int(1)