diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 4ff13f1c3..499110aca 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -50,4 +50,4 @@ jobs:
         run: docker compose -f docker-compose.yml run test_runner vendor/bin/phpunit --no-progress --testsuite Structure
 
       - name: run cs fixer
-        run:  docker run --rm -v .:/opt/project -w /opt/project php:8.3-cli sh -c 'curl -sS https://getcomposer.org/installer | php && php composer.phar run cs'
+        run:  docker run --rm -e PHP_CS_FIXER_IGNORE_ENV=1 -v .:/opt/project -w /opt/project php:8.4-cli sh -c 'curl -sS https://getcomposer.org/installer | php && php composer.phar run cs'
diff --git a/Core/Core.php b/Core/Core.php
index 82adc9244..2ed51d827 100755
--- a/Core/Core.php
+++ b/Core/Core.php
@@ -445,7 +445,6 @@ function property_exists($object_or_class, string $property): bool {}
  * @link https://secure.php.net/manual/en/function.trait-exists.php
  * @since 5.4
  */
-#[Pure(true)]
 function trait_exists(string $trait, bool $autoload = true): bool {}
 
 /**
@@ -460,7 +459,6 @@ function trait_exists(string $trait, bool $autoload = true): bool {}
  * @return bool true if <i>class_name</i> is a defined class,
  * false otherwise.
  */
-#[Pure(true)]
 function class_exists(string $class, bool $autoload = true): bool {}
 
 /**
@@ -476,7 +474,6 @@ function class_exists(string $class, bool $autoload = true): bool {}
  * <i>interface_name</i> has been defined, false otherwise.
  * @since 5.0.2
  */
-#[Pure(true)]
 function interface_exists(string $interface, bool $autoload = true): bool {}
 
 /**
@@ -508,7 +505,6 @@ function function_exists(string $function): bool {}
  * false otherwise.
  * @since 8.1
  */
-#[Pure(true)]
 function enum_exists(string $enum, bool $autoload = true): bool {}
 
 /**
@@ -609,7 +605,7 @@ function get_class_vars(string $class): array {}
  * for the specified <i>object</i> in scope. If a property have
  * not been assigned a value, it will be returned with a null value.
  */
-#[Pure(true)]
+#[Pure]
 function get_object_vars(object $object): array {}
 
 /**
@@ -817,7 +813,7 @@ function create_function(string $args, string $code): false|string {}
  * by this function, the return value will be the string
  * Unknown.
  */
-#[Pure(true)]
+#[Pure]
 function get_resource_type($resource): string {}
 
 /**
diff --git a/meta/attributes/Pure.php b/meta/attributes/Pure.php
index c4e95b6c8..26cb1a009 100644
--- a/meta/attributes/Pure.php
+++ b/meta/attributes/Pure.php
@@ -7,6 +7,7 @@
 /**
  * The attribute marks the function that has no impact on the program state or passed parameters used after the function execution.
  * This means that a function call that resolves to such a function can be safely removed if the execution result is not used in code afterwards.
+ * Functions that take a callable which is called should not have this attribute applied.
  *
  * @since 8.0
  */
diff --git a/standard/standard_8.php b/standard/standard_8.php
index a0fee6fd5..c868f2b47 100644
--- a/standard/standard_8.php
+++ b/standard/standard_8.php
@@ -244,7 +244,6 @@ function ob_end_clean(): bool {}
  * @link https://php.net/manual/en/function.ob-get-flush.php
  * @return string|false the output buffer or false if no buffering is active.
  */
-#[Pure(true)]
 function ob_get_flush(): string|false {}
 
 /**
@@ -253,7 +252,6 @@ function ob_get_flush(): string|false {}
  * @return string|false the contents of the output buffer and end output buffering.
  * If output buffering isn't active then false is returned.
  */
-#[Pure(true)]
 function ob_get_clean(): string|false {}
 
 /**
diff --git a/standard/standard_9.php b/standard/standard_9.php
index 10307c1ec..a2a4112f9 100644
--- a/standard/standard_9.php
+++ b/standard/standard_9.php
@@ -445,7 +445,6 @@ function array_intersect_uassoc(
  * array1 that are present in all the arguments.
  * @meta
  */
-#[Pure]
 function array_uintersect_uassoc(
     array $array,
     #[PhpStormStubsElementAvailable(from: '5.3', to: '7.4')] array $array2,