fix tilesheets not seasonalised when a map is reloaded (#642)

docs/release-notes.md

@@ -17,6 +17,7 @@ These changes have not been released yet.
   * Fixed some assets not updated when you switch language to English.
   * Fixed lag in some cases due to incorrect asset caching when playing in non-English.
   * Fixed lag when a mod invalidates many NPC portraits/sprites at once.
+  * Fixed seasonal tilesheet issues when a mod reloads a map.
 
 * For modders:
   * Added support for content pack translations.

src/SMAPI/Metadata/CoreAssetPropagator.cs

@@ -139,6 +139,7 @@ namespace StardewModdingAPI.Metadata
                     if (!string.IsNullOrWhiteSpace(location.mapPath.Value) && this.GetNormalisedPath(location.mapPath.Value) == key)
                     {
                         location.reloadMap();
+                        location.updateSeasonalTileSheets();
                         location.updateWarps();
                         this.Reflection.GetField<InteriorDoorDictionary>(location, nameof(location.interiorDoors)).SetValue(new InteriorDoorDictionary(location));
                         anyChanged = true;