Fix incorrect saving of custom encounters data

CHANGELOG.md

@@ -5,7 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project somewhat adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).  The MAJOR version number is bumped when there are **"Breaking Changes"** in the pret projects. For more on this, see [the manual page on breaking changes](https://huderlem.github.io/porymap/manual/breaking-changes.html).
 
 ## [Unreleased]
-Nothing, yet.
+### Fixed
+- Fix custom top-level data in the `encounters` object of `wild_encounters.json` being discarded if no `fields` data is present.
 
 ## [6.3.0] - 2025-12-26
 ### Added

src/project.cpp

@@ -1023,10 +1023,9 @@ bool Project::saveWildMonData() {
                 }
                 monInfoObject["mons"] = monArray;
                 OrderedJson::append(&monInfoObject, monInfo.customData);
-
                 encounterObject[fieldName] = monInfoObject;
-                OrderedJson::append(&encounterObject, encounterHeader.customData);
             }
+            OrderedJson::append(&encounterObject, encounterHeader.customData);
             encountersArray.push_back(encounterObject);
         }
     }