Fixup ComponentUtil#legacyToJsonString behavior on items with styles (#3868)

Author: FlorianMichael

common/src/main/java/com/viaversion/viaversion/util/ComponentUtil.java

@@ -30,6 +30,7 @@
 import net.lenni0451.mcstructs.text.events.hover.impl.TextHoverEvent;
 import net.lenni0451.mcstructs.text.serializer.LegacyStringDeserializer;
 import net.lenni0451.mcstructs.text.serializer.TextComponentSerializer;
+import net.lenni0451.mcstructs.text.utils.TextUtils;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 /**
@@ -151,12 +152,18 @@ public static String legacyToJsonString(final String message) {
 
     public static String legacyToJsonString(final String message, final boolean itemData) {
         final ATextComponent component = LegacyStringDeserializer.parse(message, true);
-        if (itemData) {
+        if (itemData && hasStyle(component)) {
             component.setParentStyle(new Style().setItalic(false));
         }
         return SerializerVersion.V1_12.toString(component);
     }
 
+    public static boolean hasStyle(final ATextComponent component) {
+        final boolean[] hasStyle = {false};
+        TextUtils.iterateAll(component, c -> hasStyle[0] |= !c.getStyle().isEmpty());
+        return hasStyle[0];
+    }
+
     public static String jsonToLegacy(final String value) {
         return TextComponentSerializer.V1_12.deserializeReader(value).asLegacyFormatString();
     }