Can't install watchOS (Watch 1.0 apps are no longer installable)

Hi, this is my first issue on Nativescript, sorry if I forgot anything and I hope this is the right place, thanks.

Environment

• CLI: 8.0.2
• Cross-platform modules: 8.0.8
• Android Runtime: -
• iOS Runtime: 8.0.0
• XCode Version: 12.5.1
• Plugin(s): -

Describe the bug
I'm unable to install an iOS Apple Watch app added to an existing nativescript iOS app.
When I run the app on the watch, the build is successful but I get this message:

Please try again later.
WatchKit 1.0 apps are no longer installable on this watchOS version.

To Reproduce
This bug is reproducible using a blank "Hello world" project.

ns create helloworld --ng
ns build ios

Then, open the .workspace. file, new target > Watch App for iOS App. Then,

Expected behavior
The app should show up on the emulator.

Additional context
When I click on "Details" of the error, this is what I get:

Details

Unable To Install “helloworld”
Domain: IXUserPresentableErrorDomain
Code: 1
Failure Reason: Please try again later.
Recovery Suggestion: WatchKit 1.0 apps are no longer installable on this watchOS version.
--
WatchKit 1.0 apps are no longer installable on this watchOS version.
Domain: MIInstallerErrorDomain
Code: 133
User Info: {
    FunctionName = "-[MIInstallableBundle _isValidWatchKitApp:withVersion:installableSigningInfo:error:]";
    LegacyErrorString = UnsupportedWatchKitVersion;
    SourceFileLine = 677;
}
--


System Information

macOS Version 11.4 (Build 20F71)
Xcode 12.5.1 (18212) (Build 12E507)
Timestamp: 2021-08-03T16:40:06+02:00

All this is based on this article: https://blog.nativescript.org/developing-a-watchos-extension-for-your-nativescript-app/ .

After looking on StackOverflow, it seems like (unrelated to Nativescript), this error can happen even if it has noting to do with the version code.

I tried changing different options based on SO answers but each time, I get this error. I also tried with a native HelloWorld project (i.e. not Nativescript), and it worked without any issue.

Thanks for your help,

Beginne damit, das Problem mit ns create helloworld --ng und ns build ios zu reproduzieren, und untersuche anschließend den generierten Workspace und das hinzugefügte Watch App-Ziel in Xcode 12.5.1. Vergleiche das generierte Projekt mit dem nativen HelloWorld-Projekt, das erfolgreich installiert wird. Als erledigt gilt die Aufgabe, wenn die NativeScript watchOS-App ohne den WatchKit 1.0-Fehler auf dem Emulator installiert wird.