Bugfix/fix world map chart component (#1871)

* Clone countries before manipulation

* Update changelog

CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+- Fixed an issue in the global heat map component caused by manipulating an input property
 - Fixed an issue with the currency inconsistency in the _EOD Historical Data_ service (convert from `GBX` to `GBp`)
 
 ## 1.256.0 - 2023-04-17

apps/client/src/app/components/world-map-chart/world-map-chart.component.ts

@@ -30,6 +30,9 @@ export class WorldMapChartComponent implements OnChanges, OnDestroy, OnInit {
   public ngOnInit() {}
 
   public ngOnChanges() {
+    // Create a copy before manipulating countries object
+    this.countries = structuredClone(this.countries);
+
     if (this.countries) {
       this.isLoading = true;