Which @angular/* package(s) are the source of the bug?

router

Is this a regression?

No

Description

When I use withComponentInputBinding with a component which has a default input value, I expect that if the input is not defined is the route data then the default input value is kept.

Actually, If a component has an input with a default value and this input has no correspondance into route data then the result will be undefined. Not my default value.

withComponentInputBinding is here to make more reusable components. So I should be able to defined default input values.

In my given example :

I have a route with my component and a route data defined for my input -> OK the value from route is used.
I have an other route with my component and no route data defined for my input -> KO value is undefined not my default value.

Please provide a link to a minimal reproduction of the bug

https://stackblitz.com/edit/mxxufqec-w8znnn3t?file=package.json

Please provide the exception or error you saw

Please provide the environment you discovered this bug in (run ng version)

Angular CLI: 19.0.7
Node: 20.19.1
Package Manager: npm 10.8.2
OS: linux x64

Angular: 19.1.0
... animations, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, router

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1900.7
@angular-devkit/build-angular   19.0.7
@angular-devkit/core            19.0.7
@angular-devkit/schematics      19.0.7
@angular/cli                    19.0.7
@schematics/angular             19.0.7
rxjs                            7.8.1
typescript                      5.6.3
zone.js                         0.15.0

Anything else?

No response