diff --git a/src/wp-includes/class-wp-block-list.php b/src/wp-includes/class-wp-block-list.php
index b56b3bd69dc3c..44e3055253a7b 100644
--- a/src/wp-includes/class-wp-block-list.php
+++ b/src/wp-includes/class-wp-block-list.php
@@ -10,6 +10,8 @@
  * Class representing a list of block instances.
  *
  * @since 5.5.0
+ *
+ * @phpstan-implements ArrayAccess<int, WP_Block>
  */
 #[AllowDynamicProperties]
 class WP_Block_List implements Iterator, ArrayAccess, Countable {
@@ -105,7 +107,7 @@ public function offsetGet( $offset ) {
 	 *
 	 * @link https://www.php.net/manual/en/arrayaccess.offsetset.php
 	 *
-	 * @param int            $offset Offset of block value to set.
+	 * @param int|null       $offset Offset of block value to set, or null to append.
 	 * @param array|WP_Block $value  Block value.
 	 */
 	#[ReturnTypeWillChange]
diff --git a/src/wp-includes/class-wp-query.php b/src/wp-includes/class-wp-query.php
index 513f0f702c61f..58c4d10f3163e 100644
--- a/src/wp-includes/class-wp-query.php
+++ b/src/wp-includes/class-wp-query.php
@@ -14,6 +14,10 @@
  *
  * @since 1.5.0
  * @since 4.5.0 Removed the `$comments_popup` property.
+ *
+ * @phpstan-property-read bool                                      $query_vars_changed
+ * @phpstan-property-read false|(lowercase-string&non-falsy-string) $query_vars_hash
+ * @phpstan-method void init_query_flags()
  */
 #[AllowDynamicProperties]
 class WP_Query {
@@ -441,6 +445,7 @@ class WP_Query {
 	 *
 	 * @since 3.1.0
 	 * @var bool|string
+	 * @phpstan-var false|(lowercase-string&non-falsy-string)
 	 */
 	private $query_vars_hash = false;
 
diff --git a/src/wp-includes/class-wp-theme.php b/src/wp-includes/class-wp-theme.php
index 87fcd7eec72b4..f7d4aba792a00 100644
--- a/src/wp-includes/class-wp-theme.php
+++ b/src/wp-includes/class-wp-theme.php
@@ -7,6 +7,20 @@
  * @since 3.4.0
  *
  * @phpstan-type Theme_Key 'Name'|'Version'|'Status'|'Title'|'Author'|'Author Name'|'Author URI'|'Description'|'Template'|'Stylesheet'|'Template Files'|'Stylesheet Files'|'Template Dir'|'Stylesheet Dir'|'Screenshot'|'Tags'|'Theme Root'|'Theme Root URI'|'Parent Theme'
+ * @property-read string|false   $name
+ * @property-read string|false   $title
+ * @property-read string|false   $version
+ * @property-read string|false   $parent_theme
+ * @property-read string         $template_dir
+ * @property-read string         $stylesheet_dir
+ * @property-read string         $template
+ * @property-read string         $stylesheet
+ * @property-read string|false   $screenshot
+ * @property-read string|false   $description
+ * @property-read string|false   $author
+ * @property-read string[]|false $tags
+ * @property-read string         $theme_root
+ * @property-read string         $theme_root_uri
  */
 #[AllowDynamicProperties]
 final class WP_Theme implements ArrayAccess {
diff --git a/src/wp-includes/class-wp-widget.php b/src/wp-includes/class-wp-widget.php
index b131c50db3226..4e1edd72fd22b 100644
--- a/src/wp-includes/class-wp-widget.php
+++ b/src/wp-includes/class-wp-widget.php
@@ -408,6 +408,8 @@ public function display_callback( $args, $widget_args = 1 ) {
 	 * @global array $wp_registered_widgets
 	 *
 	 * @param int $deprecated Not used.
+	 *
+	 * @final
 	 */
 	public function update_callback( $deprecated = 1 ) {
 		global $wp_registered_widgets;
@@ -500,6 +502,8 @@ public function update_callback( $deprecated = 1 ) {
 	 *     @type int $number Number increment used for multiples of the same widget.
 	 * }
 	 * @return string|null
+	 *
+	 * @final
 	 */
 	public function form_callback( $widget_args = 1 ) {
 		if ( is_numeric( $widget_args ) ) {
diff --git a/tests/phpstan/baselines/property.notFound.neon b/tests/phpstan/baselines/property.notFound.neon
index 460a5082ab0b8..521bc7619766a 100644
--- a/tests/phpstan/baselines/property.notFound.neon
+++ b/tests/phpstan/baselines/property.notFound.neon
@@ -158,26 +158,6 @@ parameters:
 			identifier: property.notFound
 			count: 1
 			path: ../../../src/wp-admin/includes/class-walker-nav-menu-edit.php
-		-
-			message: '#^Access to an undefined property WP_Theme\:\:\$author\.$#'
-			identifier: property.notFound
-			count: 3
-			path: ../../../src/wp-admin/includes/class-wp-debug-data.php
-		-
-			message: '#^Access to an undefined property WP_Theme\:\:\$name\.$#'
-			identifier: property.notFound
-			count: 4
-			path: ../../../src/wp-admin/includes/class-wp-debug-data.php
-		-
-			message: '#^Access to an undefined property WP_Theme\:\:\$parent_theme\.$#'
-			identifier: property.notFound
-			count: 1
-			path: ../../../src/wp-admin/includes/class-wp-debug-data.php
-		-
-			message: '#^Access to an undefined property WP_Theme\:\:\$version\.$#'
-			identifier: property.notFound
-			count: 6
-			path: ../../../src/wp-admin/includes/class-wp-debug-data.php
 		-
 			message: '#^Access to an undefined property WP_Theme\:\:\$auto_update_forced\.$#'
 			identifier: property.notFound
@@ -188,11 +168,6 @@ parameters:
 			identifier: property.notFound
 			count: 1
 			path: ../../../src/wp-admin/includes/class-wp-ms-themes-list-table.php
-		-
-			message: '#^Access to an undefined property WP_Theme\:\:\$name\.$#'
-			identifier: property.notFound
-			count: 8
-			path: ../../../src/wp-admin/includes/class-wp-site-health.php
 		-
 			message: '#^Access to an undefined property WP_Post\:\:\$_wp_attachment_image_alt\.$#'
 			identifier: property.notFound
@@ -228,11 +203,6 @@ parameters:
 			identifier: property.notFound
 			count: 2
 			path: ../../../src/wp-admin/nav-menus.php
-		-
-			message: '#^Access to an undefined property WP_Theme\:\:\$version\.$#'
-			identifier: property.notFound
-			count: 1
-			path: ../../../src/wp-admin/update-core.php
 		-
 			message: '#^Access to an undefined property WP_Post\:\:\$description\.$#'
 			identifier: property.notFound
diff --git a/tests/phpstan/baselines/property.private.neon b/tests/phpstan/baselines/property.private.neon
index 900a8e51dc423..7549ab9c5ddd5 100644
--- a/tests/phpstan/baselines/property.private.neon
+++ b/tests/phpstan/baselines/property.private.neon
@@ -18,16 +18,6 @@
 
 parameters:
 	ignoreErrors:
-		-
-			message: '#^Access to private property WP_Theme\:\:\$stylesheet\.$#'
-			identifier: property.private
-			count: 20
-			path: ../../../src/wp-admin/includes/class-wp-debug-data.php
-		-
-			message: '#^Access to private property WP_Theme\:\:\$template\.$#'
-			identifier: property.private
-			count: 2
-			path: ../../../src/wp-admin/includes/class-wp-debug-data.php
 		-
 			message: '#^Access to private property WP_Block_Type\:\:\$uses_context\.$#'
 			identifier: property.private