diff --git a/src/wp-includes/class-wp-block-list.php b/src/wp-includes/class-wp-block-list.php
index 2505920755..4e30f1c5f9 100644
--- a/src/wp-includes/class-wp-block-list.php
+++ b/src/wp-includes/class-wp-block-list.php
@@ -63,59 +63,59 @@ class WP_Block_List implements Iterator, ArrayAccess, Countable {
 	}
 
 	/**
-	 * Returns true if a block exists by the specified block index, or false
+	 * Returns true if a block exists by the specified block offset, or false
 	 * otherwise.
 	 *
 	 * @since 5.5.0
 	 *
 	 * @link https://www.php.net/manual/en/arrayaccess.offsetexists.php
 	 *
-	 * @param string $index Index of block to check.
+	 * @param string $offset Offset of block to check for.
 	 * @return bool Whether block exists.
 	 */
 	#[ReturnTypeWillChange]
-	public function offsetExists( $index ) {
-		return isset( $this->blocks[ $index ] );
+	public function offsetExists( $offset ) {
+		return isset( $this->blocks[ $offset ] );
 	}
 
 	/**
-	 * Returns the value by the specified block index.
+	 * Returns the value by the specified block offset.
 	 *
 	 * @since 5.5.0
 	 *
 	 * @link https://www.php.net/manual/en/arrayaccess.offsetget.php
 	 *
-	 * @param string $index Index of block value to retrieve.
+	 * @param string $offset Offset of block value to retrieve.
 	 * @return mixed|null Block value if exists, or null.
 	 */
 	#[ReturnTypeWillChange]
-	public function offsetGet( $index ) {
-		$block = $this->blocks[ $index ];
+	public function offsetGet( $offset ) {
+		$block = $this->blocks[ $offset ];
 
 		if ( isset( $block ) && is_array( $block ) ) {
 			$block                  = new WP_Block( $block, $this->available_context, $this->registry );
-			$this->blocks[ $index ] = $block;
+			$this->blocks[ $offset ] = $block;
 		}
 
 		return $block;
 	}
 
 	/**
-	 * Assign a block value by the specified block index.
+	 * Assign a block value by the specified block offset.
 	 *
 	 * @since 5.5.0
 	 *
 	 * @link https://www.php.net/manual/en/arrayaccess.offsetset.php
 	 *
-	 * @param string $index Index of block value to set.
+	 * @param string $offset Offset of block value to set.
 	 * @param mixed  $value Block value.
 	 */
 	#[ReturnTypeWillChange]
-	public function offsetSet( $index, $value ) {
-		if ( is_null( $index ) ) {
+	public function offsetSet( $offset, $value ) {
+		if ( is_null( $offset ) ) {
 			$this->blocks[] = $value;
 		} else {
-			$this->blocks[ $index ] = $value;
+			$this->blocks[ $offset ] = $value;
 		}
 	}
 
@@ -126,11 +126,11 @@ class WP_Block_List implements Iterator, ArrayAccess, Countable {
 	 *
 	 * @link https://www.php.net/manual/en/arrayaccess.offsetunset.php
 	 *
-	 * @param string $index Index of block value to unset.
+	 * @param string $offset Offset of block value to unset.
 	 */
 	#[ReturnTypeWillChange]
-	public function offsetUnset( $index ) {
-		unset( $this->blocks[ $index ] );
+	public function offsetUnset( $offset ) {
+		unset( $this->blocks[ $offset ] );
 	}
 
 	/**