Index: src/wp-content/themes/twentytwentytwo/style.css
===================================================================
--- src/wp-content/themes/twentytwentytwo/style.css	(revision 55422)
+++ src/wp-content/themes/twentytwentytwo/style.css	(working copy)
@@ -159,3 +159,24 @@
 .wp-block-post-comments ol.commentlist ul.children li:not(:last-child) {
 	margin-bottom: 1rem;
 }
+
+/*
+ * Improves label alignment for the legacy Post Comments block.
+ * https://core.trac.wordpress.org/ticket/57542
+ */
+
+.wp-block-post-comments .comment-form-comment label,
+.wp-block-post-comments .comment-form-author label,
+.wp-block-post-comments .comment-form-email label,
+.wp-block-post-comments .comment-form-url label {
+	display: block;
+	margin-bottom: 0.25em;
+}
+
+.wp-block-post-comments .comment-form textarea,
+.wp-block-post-comments .comment-form input:not([type="submit"]):not([type="checkbox"]) {
+	display: block;
+	box-sizing: border-box;
+	width: 100%;
+	padding: calc(0.667em + 2px);
+}