diff --git a/packages/compiler-cli/src/ngtsc/typecheck/src/type_check_block.ts b/packages/compiler-cli/src/ngtsc/typecheck/src/type_check_block.ts
index a71944c421..8ed454f336 100644
--- a/packages/compiler-cli/src/ngtsc/typecheck/src/type_check_block.ts
+++ b/packages/compiler-cli/src/ngtsc/typecheck/src/type_check_block.ts
@@ -1187,7 +1187,10 @@ function tcbGetDirectiveInputs(
 
   // To determine which of directive's inputs are unset, we keep track of the set of field names
   // that have not been seen yet. A field is removed from this set once a binding to it is found.
-  const unsetFields = new Set(propMatch.values());
+  // Note: it's actually important here that `propMatch.values()` isn't used, as there can be
+  // multiple fields which share the same property name and only one of them will be listed as a
+  // value in `propMatch`.
+  const unsetFields = new Set(Object.keys(inputs));
 
   el.inputs.forEach(processAttribute);
   el.attributes.forEach(processAttribute);
diff --git a/packages/compiler-cli/test/ngtsc/template_typecheck_spec.ts b/packages/compiler-cli/test/ngtsc/template_typecheck_spec.ts
index 543f106218..97641b203d 100644
--- a/packages/compiler-cli/test/ngtsc/template_typecheck_spec.ts
+++ b/packages/compiler-cli/test/ngtsc/template_typecheck_spec.ts
@@ -174,6 +174,33 @@ export declare class AnimationEvent {
           .toEqual(`Argument of type 'string' is not assignable to parameter of type 'number'.`);
     });
 
+    it('should support one input property mapping to multiple fields', () => {
+      env.write('test.ts', `
+        import {Component, Directive, Input, NgModule} from '@angular/core';
+
+        @Directive({
+          selector: '[dir]',
+        })
+        export class Dir {
+
+          @Input('propertyName') fieldA!: string;
+          @Input('propertyName') fieldB!: string;
+        }
+
+        @Component({
+          selector: 'test-cmp',
+          template: '<div dir propertyName="test"></div>',
+        })
+        export class Cmp {}
+
+        @NgModule({declarations: [Dir, Cmp]})
+        export class Module {}
+      `);
+
+      const diags = env.driveDiagnostics();
+      expect(diags.length).toBe(0);
+    });
+
     it('should check event bindings', () => {
       env.tsconfig({fullTemplateTypeCheck: true, strictOutputEventTypes: true});
       env.write('test.ts', `