Stuck on build error on migration of basic Tabs from {N} 6 to 8 - nativescript

Question

We have an app written in NativeScript Angular and based on BottomNavigation and TabView.
I've posted before about issues we have had building our app after migrating from NativeScript 6 to 8.
I can't share our code base so I have taken the legacy code in {N} 6 and stripped out all of our own components to leave just the bare bones.
There is a public repo here: https://github.com/syborp/testapp
It builds and runs fine in {N} 6 and there is a screenshot on the GitHub README.
When we migrate to {N} 8 we keep ending up at this error.
Searching for devices...
Preparing project...
webpack is watching the files...
C:\Users\user\testapp\node_modules\#angular\compiler-cli\ngcc\src\entry_point_finder\targeted_entry_point_finder.js:40
throw new Error("The target entry-point \"" + invalidTarget.entryPoint.name + "\" has missing dependencies:\n" +
^
Error: The target entry-point "undefined" has missing dependencies:
- nativescript-angular/element-registry
at TargetedEntryPointFinder.findEntryPoints (C:\Users\user\testapp\node_modules\#angular\compiler-cli\ngcc\src\entry_point_finder\targeted_entry_point_finder.js:40:23)
at C:\Users\user\testapp\node_modules\#angular\compiler-cli\ngcc\src\execution\analyze_entry_points.js:29:41
at SingleProcessExecutorSync.SingleProcessorExecutorBase.doExecute (C:\Users\user\testapp\node_modules\#angular\compiler-cli\ngcc\src\execution\single_process_executor.js:28:29)
at C:\Users\user\testapp\node_modules\#angular\compiler-cli\ngcc\src\execution\single_process_executor.js:57:59
at SyncLocker.lock (C:\Users\user\testapp\node_modules\#angular\compiler-cli\ngcc\src\locking\sync_locker.js:34:24)
at SingleProcessExecutorSync.execute (C:\Users\user\testapp\node_modules\#angular\compiler-cli\ngcc\src\execution\single_process_executor.js:57:27)
at Object.mainNgcc (C:\Users\user\testapp\node_modules\#angular\compiler-cli\ngcc\src\main.js:74:25)
at Object.process (C:\Users\user\testapp\node_modules\#angular\compiler-cli\ngcc\index.js:29:23)
at NgccProcessor.processModule (C:\Users\user\testapp\node_modules\#ngtools\webpack\src\ngcc_processor.js:175:16)
at C:\Users\user\testapp\node_modules\#ngtools\webpack\src\ivy\host.js:146:18
at C:\Users\user\testapp\node_modules\#ngtools\webpack\src\ivy\host.js:76:24
at Array.map (<anonymous>)
at Object.host.resolveModuleNames (C:\Users\user\testapp\node_modules\#ngtools\webpack\src\ivy\host.js:74:32)
at actualResolveModuleNamesWorker (C:\Users\user\testapp\node_modules\typescript\lib\typescript.js:109497:133)
at resolveModuleNamesWorker (C:\Users\user\testapp\node_modules\typescript\lib\typescript.js:109760:26)
at resolveModuleNamesReusingOldState (C:\Users\user\testapp\node_modules\typescript\lib\typescript.js:109857:24)
Executing webpack failed with exit code 1.
It sounds like the entry point main.ts cannot be found but I think it looks ok in package.json.
"description": "Test App",
"license": "SEE LICENSE IN <your-license-filename>",
"readme": "NativeScript Application",
"repository": "<fill-your-repository-here>",
"scripts": {
"lint": "tslint \"app/**/*.ts\""
},
"dependencies": {
"#angular/animations": "^12.2.5",
"#angular/common": "^12.2.5",
"#angular/compiler": "^12.2.5",
"#angular/core": "^12.2.5",
"#angular/forms": "^12.2.5",
"#angular/http": "8.0.0-beta.10",
"#angular/platform-browser": "^12.2.5",
"#angular/platform-browser-dynamic": "^12.2.5",
"#angular/router": "^12.2.5",
"#master.technology/permissions": "^2.0.1",
"#nativescript/angular": "^12.2.0",
"#nativescript/core": "~8.1.1",
"#nativescript/fingerprint-auth": "^8.0.0",
"nativescript": "^6.5.0",
"nativescript-app-sync": "^2.0.0",
"nativescript-bottom-navigation": "^2.0.5",
"nativescript-camera": "^4.0.2",
"nativescript-drop-down": "^5.0.6",
"nativescript-fancyalert": "^3.0.9",
"nativescript-fingerprint-auth": "^7.0.2",
"nativescript-fontawesome": "^1.0.0",
"nativescript-gradient": "^2.0.1",
"nativescript-imagepicker": "^7.1.0",
"nativescript-iqkeyboardmanager": "^1.5.1",
"nativescript-modal-datetimepicker": "^1.1.4",
"nativescript-pdf-view": "^2.1.0",
"nativescript-permissions": "^1.3.12",
"nativescript-theme-core": "~1.0.4",
"nativescript-toast": "^1.4.6",
"nativescript-ui-listview": "^10.0.2",
"reflect-metadata": "~0.1.10",
"ruby": "^0.6.1",
"rxjs": "~7.3.0",
"zone.js": "~0.11.4"
},
"devDependencies": {
"#angular-devkit/build-angular": "^13.2.5",
"#angular/cli": "^12.2.5",
"#angular/compiler-cli": "^12.2.5",
"#nativescript/android": "~8.1.1",
"#nativescript/webpack": "~5.0.0",
"#ngtools/webpack": "^12.2.5",
"#types/node": "14.6.2",
"babel-traverse": "6.26.0",
"babel-types": "6.26.0",
"babylon": "6.18.0",
"codelyzer": "~4.5.0",
"extract-text-webpack-plugin": "~3.0.2",
"lazy": "1.0.11",
"sass": "~1.39.0",
"tslint": "~5.12.1",
"typescript": "~4.3.5",
"uglifyjs-webpack-plugin": "^2.2.0"
},
"main": "./app/main.ts"
}
Or is it a webpack issue?
Any advice much appreciated.
TIA.