diff --git a/lib/compat/plugin/footnotes.php b/lib/compat/plugin/footnotes.php
index 915e554cea7ae..7699f3112560c 100644
--- a/lib/compat/plugin/footnotes.php
+++ b/lib/compat/plugin/footnotes.php
@@ -34,10 +34,4 @@
 	if ( has_filter( 'rest_pre_insert_post', '_wp_rest_api_force_autosave_difference' ) ) {
 		remove_filter( 'rest_pre_insert_post', '_wp_rest_api_force_autosave_difference' );
 	}
-	if ( has_filter( '_wp_post_revision_field_footnotes', 'wp_get_footnotes_from_revision' ) ) {
-		remove_filter( '_wp_post_revision_field_footnotes', 'wp_get_footnotes_from_revision' );
-	}
-	if ( has_filter( '_wp_post_revision_fields', 'wp_add_footnotes_to_revision' ) ) {
-		remove_filter( '_wp_post_revision_fields', 'wp_add_footnotes_to_revision' );
-	}
 }
diff --git a/packages/block-library/src/footnotes/index.php b/packages/block-library/src/footnotes/index.php
index f8b5f6248a4d4..dfe6336b0929d 100644
--- a/packages/block-library/src/footnotes/index.php
+++ b/packages/block-library/src/footnotes/index.php
@@ -200,7 +200,6 @@ function wp_restore_footnotes_from_revision( $post_id, $revision_id ) {
  * Adds the footnotes field to the revisions display.
  *
  * @since 6.3.0
- * @since 6.4.0 Core added post meta revisions, so this is no longer needed.
  *
  * @param array $fields The revision fields.
  * @return array The revision fields.
@@ -209,15 +208,12 @@ function wp_add_footnotes_to_revision( $fields ) {
 	$fields['footnotes'] = __( 'Footnotes' );
 	return $fields;
 }
-if ( ! function_exists( 'wp_post_revision_meta_keys' ) ) {
-	add_filter( '_wp_post_revision_fields', 'wp_add_footnotes_to_revision' );
-}
+add_filter( '_wp_post_revision_fields', 'wp_add_footnotes_to_revision' );
 
 /**
  * Gets the footnotes field from the revision for the revisions screen.
  *
  * @since 6.3.0
- * @since 6.4.0 Core added post meta revisions, so this is no longer needed.
  *
  * @param string $revision_field The field value, but $revision->$field
  *                               (footnotes) does not exist.
@@ -228,9 +224,7 @@ function wp_add_footnotes_to_revision( $fields ) {
 function wp_get_footnotes_from_revision( $revision_field, $field, $revision ) {
 	return get_metadata( 'post', $revision->ID, $field, true );
 }
-if ( ! function_exists( 'wp_post_revision_meta_keys' ) ) {
-	add_filter( '_wp_post_revision_field_footnotes', 'wp_get_footnotes_from_revision', 10, 3 );
-}
+add_filter( '_wp_post_revision_field_footnotes', 'wp_get_footnotes_from_revision', 10, 3 );
 
 /**
  * The REST API autosave endpoint doesn't save meta, so we can use the