working state

src/Discord.Net.Interactions/Builders/ModuleBuilder.cs

@@ -195,6 +195,19 @@ namespace Discord.Interactions.Builders
             return this;
         }
 
+        /// <summary>
+        ///     Sets <see cref="IsNsfw"/>.
+        /// </summary>
+        /// <param name="isNsfw">New value of the <see cref="IsNsfw"/>.</param>
+        /// <returns>
+        ///     The builder instance.
+        /// </returns>
+        public ModuleBuilder SetNsfw(bool isNsfw)
+        {
+            IsNsfw = isNsfw;
+            return this;
+        }
+
         /// <summary>
         ///     Sets <see cref="DefaultMemberPermissions"/>.
         /// </summary>

src/Discord.Net.Interactions/Builders/ModuleClassBuilder.cs

@@ -102,7 +102,7 @@ namespace Discord.Interactions.Builders
                         builder.DontAutoRegister = true;
                         break;
                     case NsfwCommandAttribute nsfwCommand:
-                        builder.IsNsfw = nsfwCommand.IsNsfw;
+                        builder.SetNsfw(nsfwCommand.IsNsfw);
                         break;
                     default:
                         builder.AddAttributes(attribute);

src/Discord.Net.Interactions/Utilities/ApplicationCommandRestUtil.cs

@@ -165,6 +165,7 @@ namespace Discord.Interactions
                     Description = moduleInfo.Description,
                     IsDefaultPermission = moduleInfo.DefaultPermission,
                     IsDMEnabled = moduleInfo.IsEnabledInDm,
+                    IsNsfw = moduleInfo.IsNsfw,
                     DefaultMemberPermissions = moduleInfo.DefaultMemberPermissions
                 }
                 .WithNameLocalizations(localizationManager?.GetAllNames(modulePath, LocalizationTarget.Group) ?? ImmutableDictionary<string, string>.Empty)