Allow instrumented DerivedProperties to update during PhET-iO state s…

…et, see #409
phetsims · Aug 24, 2022 · c00fd24 · c00fd24
1 parent 2c7a899
commit c00fd24
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/js/ReadOnlyProperty.ts b/js/ReadOnlyProperty.ts
@@ -229,7 +229,10 @@ export default class ReadOnlyProperty<T> extends PhetioObject implements TReadOn
 
     // state is managed by the PhetioStateEngine
     const setManagedByPhetioState = window.phet && phet?.joist?.sim?.isSettingPhetioStateProperty.value
-                                    && this.isPhetioInstrumented() && this.phetioState;
+                                    && this.isPhetioInstrumented() && this.phetioState
+
+                                    // However, DerivedProperty should be able to update during PhET-iO state set
+                                    && this.isSettable();
 
     if ( !setManagedByPhetioState ) {
       this.unguardedSet( value );