diff --git a/inc/render.php b/inc/render.php
index 94c51a5..2fefda3 100644
--- a/inc/render.php
+++ b/inc/render.php
@@ -112,8 +112,9 @@ static function ( array $matches ) use ( $icon, $position ): string {
  * front end is the raw comment JSON, never merged against registered
  * defaults — see the file docblock in `inc/attributes.php`. So an explicit
  * `'hidden'` or an explicit `'mobile'` always wins, and a `'visible'` only
- * counts once the legacy flag is confirmed clear; otherwise the legacy flag
- * decides, exactly as it did before this attribute existed.
+ * counts once the legacy flag is confirmed clear. Otherwise the legacy flag
+ * decides, exactly as it did before this attribute existed. A value outside
+ * the enum is treated as absent, so it never hides a label by itself.
  *
  * @param array $attributes The block's attributes.
  * @return string One of 'visible', 'mobile', 'hidden'.
@@ -121,15 +122,11 @@ static function ( array $matches ) use ( $icon, $position ): string {
 function label_visibility( array $attributes ): string {
 	$visibility = $attributes['hmLabelVisibility'] ?? 'visible';
 
-	if ( 'hidden' === $visibility ) {
-		return 'hidden';
+	if ( in_array( $visibility, [ 'hidden', 'mobile' ], true ) ) {
+		return $visibility;
 	}
 
-	if ( 'visible' === $visibility && empty( $attributes['hmHideLabelOnMobile'] ) ) {
-		return 'visible';
-	}
-
-	return 'mobile';
+	return empty( $attributes['hmHideLabelOnMobile'] ) ? 'visible' : 'mobile';
 }
 
 /**
diff --git a/src/index.js b/src/index.js
index 1c757eb..5cfe8c7 100644
--- a/src/index.js
+++ b/src/index.js
@@ -80,15 +80,11 @@ const NO_ICON = {
 function resolveLabelVisibility( attributes ) {
 	const { hmLabelVisibility, hmHideLabelOnMobile } = attributes;
 
-	if ( 'hidden' === hmLabelVisibility ) {
-		return 'hidden';
+	if ( [ 'hidden', 'mobile' ].includes( hmLabelVisibility ) ) {
+		return hmLabelVisibility;
 	}
 
-	if ( 'visible' === hmLabelVisibility && ! hmHideLabelOnMobile ) {
-		return 'visible';
-	}
-
-	return 'mobile';
+	return hmHideLabelOnMobile ? 'mobile' : 'visible';
 }
 
 /**