fix IsWorldReady being editable by mods

docs/release-notes.md

@@ -18,6 +18,7 @@
 * For mod authors:
   * Added `IsActiveForScreen()` method to `PerScreen<T>`.
   * Updated to [FluentHttpClient](https://github.com/Pathoschild/FluentHttpClient#readme) 4.3.0 (see [changes](https://github.com/Pathoschild/FluentHttpClient/blob/develop/RELEASE-NOTES.md#430)).
+  * Fixed `Context.IsWorldReady` being editable by mods.
 
 ## 3.18.2
 Released 09 January 2023 for Stardew Valley 1.5.6 or later.

src/SMAPI/Context.cs

@@ -60,7 +60,7 @@ namespace StardewModdingAPI
         public static bool IsWorldReady
         {
             get => Context.IsWorldReadyForScreen.Value;
-            set => Context.IsWorldReadyForScreen.Value = value;
+            internal set => Context.IsWorldReadyForScreen.Value = value;
         }
 
         /// <summary>Whether <see cref="IsWorldReady"/> is true and the player is free to act in the world (no menu is displayed, no cutscene is in progress, etc).</summary>