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,

Start by reproducing the issue with ns create helloworld --ng and ns build ios, then inspect the generated workspace and added Watch App target in Xcode 12.5.1. Compare the generated project with the native HelloWorld project that installs successfully. Done means the NativeScript watchOS app installs on the emulator without the WatchKit 1.0 error.