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wp-content/plugins/jetpack-boost/compatibility/yoast.php

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+<?php
+/**
+ * Yoast SEO compatibility for Boost
+ *
+ * @package automattic/jetpack-boost
+ */
+
+namespace Automattic\Jetpack_Boost\Compatibility\Yoast;
+
+use Automattic\Jetpack_Boost\Jetpack_Boost;
+
+// Add the Critical CSS generation query arg to Yoast's allowed query args list.
+// This prevents Yoast from removing the query arg, which breaks Critical CSS generation.
+add_filter( 'Yoast\WP\SEO\allowlist_permalink_vars', array( Jetpack_Boost::class, 'whitelist_query_args' ) );