Hi
Not sure where to put this as I am new here, but you can get rid of the first error message by applying this patch to wp-content/plugins/kirki/kirki-packages/compatibility/src/Field.php:
--- Field.php.orig 2025-07-18 09:39:29.239111345 +0100
+++ Field.php 2025-07-18 09:51:08.543649923 +0100
@@ -31,6 +31,7 @@
public $button_label;
public $description;
public $help;
+ public $compiler;
protected $args = array();