diff --git a/src/wp-admin/includes/class-wp-filesystem-base.php b/src/wp-admin/includes/class-wp-filesystem-base.php
index 4972c8421cf11..75ab85cd63d34 100644
--- a/src/wp-admin/includes/class-wp-filesystem-base.php
+++ b/src/wp-admin/includes/class-wp-filesystem-base.php
@@ -606,6 +606,8 @@ public function chgrp( $file, $group, $recursive = false ) {
 	 * @param bool      $recursive Optional. If set to true, changes file permissions recursively.
 	 *                             Default false.
 	 * @return bool True on success, false on failure.
+	 *
+	 * @phpstan-impure
 	 */
 	public function chmod( $file, $mode = false, $recursive = false ) {
 		return false;
diff --git a/src/wp-includes/capabilities.php b/src/wp-includes/capabilities.php
index 6f8b57d50b348..a1193dc3363d3 100644
--- a/src/wp-includes/capabilities.php
+++ b/src/wp-includes/capabilities.php
@@ -909,6 +909,8 @@ function map_meta_cap( $cap, $user_id, ...$args ) {
  * @param mixed  ...$args    Optional further parameters, typically starting with an object ID.
  * @return bool Whether the current user has the given capability. If `$capability` is a meta cap and `$object_id` is
  *              passed, whether the current user has the given meta capability for the given object.
+ *
+ * @phpstan-impure
  */
 function current_user_can( $capability, ...$args ) {
 	return user_can( wp_get_current_user(), $capability, ...$args );
diff --git a/tests/phpstan/baselines/booleanAnd.leftAlwaysTrue.neon b/tests/phpstan/baselines/booleanAnd.leftAlwaysTrue.neon
index 2ea5a45c3cfc2..d8513fc67ef09 100644
--- a/tests/phpstan/baselines/booleanAnd.leftAlwaysTrue.neon
+++ b/tests/phpstan/baselines/booleanAnd.leftAlwaysTrue.neon
@@ -18,11 +18,6 @@
 
 parameters:
 	ignoreErrors:
-		-
-			message: '#^Left side of && is always true\.$#'
-			identifier: booleanAnd.leftAlwaysTrue
-			count: 1
-			path: ../../../src/wp-admin/network/users.php
 		-
 			message: '#^Left side of && is always true\.$#'
 			identifier: booleanAnd.leftAlwaysTrue
diff --git a/tests/phpstan/baselines/booleanNot.alwaysFalse.neon b/tests/phpstan/baselines/booleanNot.alwaysFalse.neon
index 57e8a715cfc8d..2f179a2b44ed0 100644
--- a/tests/phpstan/baselines/booleanNot.alwaysFalse.neon
+++ b/tests/phpstan/baselines/booleanNot.alwaysFalse.neon
@@ -18,26 +18,6 @@
 
 parameters:
 	ignoreErrors:
-		-
-			message: '#^Negated boolean expression is always false\.$#'
-			identifier: booleanNot.alwaysFalse
-			count: 1
-			path: ../../../src/wp-admin/includes/theme.php
-		-
-			message: '#^Negated boolean expression is always false\.$#'
-			identifier: booleanNot.alwaysFalse
-			count: 1
-			path: ../../../src/wp-admin/link-manager.php
-		-
-			message: '#^Negated boolean expression is always false\.$#'
-			identifier: booleanNot.alwaysFalse
-			count: 2
-			path: ../../../src/wp-admin/network/users.php
-		-
-			message: '#^Negated boolean expression is always false\.$#'
-			identifier: booleanNot.alwaysFalse
-			count: 1
-			path: ../../../src/wp-admin/plugins.php
 		-
 			message: '#^Negated boolean expression is always false\.$#'
 			identifier: booleanNot.alwaysFalse
diff --git a/tests/phpstan/baselines/booleanNot.alwaysTrue.neon b/tests/phpstan/baselines/booleanNot.alwaysTrue.neon
index f60969836878e..b61a98cef358e 100644
--- a/tests/phpstan/baselines/booleanNot.alwaysTrue.neon
+++ b/tests/phpstan/baselines/booleanNot.alwaysTrue.neon
@@ -23,21 +23,6 @@ parameters:
 			identifier: booleanNot.alwaysTrue
 			count: 1
 			path: ../../../src/wp-admin/includes/class-custom-image-header.php
-		-
-			message: '#^Negated boolean expression is always true\.$#'
-			identifier: booleanNot.alwaysTrue
-			count: 1
-			path: ../../../src/wp-admin/includes/class-language-pack-upgrader.php
-		-
-			message: '#^Negated boolean expression is always true\.$#'
-			identifier: booleanNot.alwaysTrue
-			count: 1
-			path: ../../../src/wp-admin/includes/class-wp-upgrader.php
-		-
-			message: '#^Negated boolean expression is always true\.$#'
-			identifier: booleanNot.alwaysTrue
-			count: 1
-			path: ../../../src/wp-admin/includes/file.php
 		-
 			message: '#^Negated boolean expression is always true\.$#'
 			identifier: booleanNot.alwaysTrue
diff --git a/tests/phpstan/baselines/if.alwaysTrue.neon b/tests/phpstan/baselines/if.alwaysTrue.neon
index a7145cf63fea5..6f5169ee0b1e6 100644
--- a/tests/phpstan/baselines/if.alwaysTrue.neon
+++ b/tests/phpstan/baselines/if.alwaysTrue.neon
@@ -18,16 +18,6 @@
 
 parameters:
 	ignoreErrors:
-		-
-			message: '#^If condition is always true\.$#'
-			identifier: if.alwaysTrue
-			count: 1
-			path: ../../../src/wp-admin/my-sites.php
-		-
-			message: '#^If condition is always true\.$#'
-			identifier: if.alwaysTrue
-			count: 2
-			path: ../../../src/wp-admin/upload.php
 		-
 			message: '#^If condition is always true\.$#'
 			identifier: if.alwaysTrue
diff --git a/tests/phpstan/baselines/ternary.alwaysTrue.neon b/tests/phpstan/baselines/ternary.alwaysTrue.neon
index 295254051f683..1f96f3ac23c46 100644
--- a/tests/phpstan/baselines/ternary.alwaysTrue.neon
+++ b/tests/phpstan/baselines/ternary.alwaysTrue.neon
@@ -23,8 +23,3 @@ parameters:
 			identifier: ternary.alwaysTrue
 			count: 1
 			path: ../../../src/wp-admin/menu-header.php
-		-
-			message: '#^Ternary operator condition is always true\.$#'
-			identifier: ternary.alwaysTrue
-			count: 1
-			path: ../../../src/wp-admin/theme-install.php