diff --git a/site/_includes/docs_toc.md b/site/_includes/docs_toc.md
index e658f7baf1..35cfa70926 100644
--- a/site/_includes/docs_toc.md
+++ b/site/_includes/docs_toc.md
@@ -287,6 +287,7 @@
         - [Nominal]({{site.baseurl}}/docs/type.html#nominal)
         - [GeoJSON]({{site.baseurl}}/docs/type.html#geojson)
     - [Value]({{site.baseurl}}/docs/value.html)
+        - [Examples]({{site.baseurl}}/docs/value.html#examples)
 - [Projection]({{site.baseurl}}/docs/projection.html)
     - [Documentation Overview]({{site.baseurl}}/docs/projection.html#documentation-overview)
     - [Projection Properties]({{site.baseurl}}/docs/projection.html#projection-properties)
@@ -329,6 +330,7 @@
     - [Using Parameters]({{site.baseurl}}/docs/parameter.html#using-parameters)
     - [Selection Configuration]({{site.baseurl}}/docs/parameter.html#config)
     - [Value]({{site.baseurl}}/docs/value.html)
+        - [Examples]({{site.baseurl}}/docs/value.html#examples)
     - [Expr]({{site.baseurl}}/docs/parameter.html)
         - [Documentation Overview]({{site.baseurl}}/docs/parameter.html#documentation-overview)
         - [Defining a Parameter]({{site.baseurl}}/docs/parameter.html#defining-a-parameter)
diff --git a/src/compile/mark/encode/defined.ts b/src/compile/mark/encode/defined.ts
index 7b0f9bfdcd..a73fcd4f99 100644
--- a/src/compile/mark/encode/defined.ts
+++ b/src/compile/mark/encode/defined.ts
@@ -30,7 +30,7 @@ function allFieldsInvalidPredicate(
     const scaleComponent = model.getScaleComponent(channel);
     if (scaleComponent) {
       const scaleType = scaleComponent.get('type');
-      const field = model.vgField(channel, {expr: 'datum'});
+      const field = model.vgField(channel, {expr: 'datum', binSuffix: model.stack?.impute ? 'mid' : undefined});
 
       // While discrete domain scales can handle invalid values, continuous scales can't.
       if (field && hasContinuousDomain(scaleType)) {
diff --git a/test/compile/mark/area.test.ts b/test/compile/mark/area.test.ts
index 355e6971eb..e1baae809f 100644
--- a/test/compile/mark/area.test.ts
+++ b/test/compile/mark/area.test.ts
@@ -53,6 +53,10 @@ describe('Mark: Area', () => {
     it('should use bin_mid for x', () => {
       expect(props.x).toEqual({field: 'bin_maxbins_10_IMDB_Rating_mid', scale: 'x'});
     });
+
+    it('should use bin_mid for the defined check', () => {
+      expect(props.defined['signal']).toContain('bin_maxbins_10_IMDB_Rating_mid');
+    });
   });
 
   describe('vertical area, with zero=false', () => {