diff --git a/Zend/zend_inheritance.c b/Zend/zend_inheritance.c
index 4cefbd58fc7..491d68714b3 100644
--- a/Zend/zend_inheritance.c
+++ b/Zend/zend_inheritance.c
@@ -1996,9 +1996,9 @@ static void zend_add_trait_method(zend_class_entry *ce, zend_string *name, zend_
 	} else {
 		new_fn = zend_arena_alloc(&CG(arena), sizeof(zend_op_array));
 		memcpy(new_fn, fn, sizeof(zend_op_array));
-		new_fn->op_array.fn_flags |= ZEND_ACC_TRAIT_CLONE;
 		new_fn->op_array.fn_flags &= ~ZEND_ACC_IMMUTABLE;
 	}
+	new_fn->common.fn_flags |= ZEND_ACC_TRAIT_CLONE;
 
 	/* Reassign method name, in case it is an alias. */
 	new_fn->common.function_name = name;
diff --git a/ext/opcache/tests/gh13712.phpt b/ext/opcache/tests/gh13712.phpt
new file mode 100644
index 00000000000..e770375e33e
--- /dev/null
+++ b/ext/opcache/tests/gh13712.phpt
@@ -0,0 +1,23 @@
+--TEST--
+GH-13712 (Segmentation fault for enabled observers when calling trait method of internal trait when opcache is loaded)
+--EXTENSIONS--
+opcache
+zend_test
+--INI--
+zend_test.observer.enabled=1
+opcache.enable=1
+opcache.enable_cli=1
+--FILE--
+<?php
+class Foo {
+	use _ZendTestTrait;
+}
+
+$f = new Foo();
+var_dump($f->testMethod());
+?>
+--EXPECTF--
+<!-- init '%s' -->
+<!-- init Foo::testMethod() -->
+<!-- init var_dump() -->
+bool(true)
diff --git a/ext/opcache/zend_persist.c b/ext/opcache/zend_persist.c
index e13a38d1676..3e0b9ee3724 100644
--- a/ext/opcache/zend_persist.c
+++ b/ext/opcache/zend_persist.c
@@ -730,7 +730,7 @@ static void zend_persist_class_method(zval *zv, zend_class_entry *ce)
 				}
 				// Real dynamically created internal functions like enum methods must have their own run_time_cache pointer. They're always on the same scope as their defining class.
 				// However, copies - as caused by inheritance of internal methods - must retain the original run_time_cache pointer, shared with the source function.
-				if (!op_array->scope || op_array->scope == ce) {
+				if (!op_array->scope || (op_array->scope == ce && !(op_array->fn_flags & ZEND_ACC_TRAIT_CLONE))) {
 					ZEND_MAP_PTR_NEW(op_array->run_time_cache);
 				}
 			}