Random Crashes with ns7 core modules

Comienza en app/packages/core/ui/core/view/index.ios.ts, en _removeViewFromNativeVisualTree, y sigue las llamadas de teardown a través de view-base/index.ts y layout-base-common.ts. Reproduce la aserción en un dispositivo iOS usando la configuración indicada de NativeScript 7 y Xcode 12, y confirma después que la ruta de teardown ya no falla en las condiciones observadas.

We're also experiencing pretty random but often crash from time to time on iOS devices with latest NS 7 core modules and the project built with Xcode 12:

====== Assertion failed ======
Native stack trace:
1          0x1019f4f3c tns::Assert(bool, v8::Isolate*) + 128
2          0x10196178c tns::ArgConverter::Invoke(v8::Local<v8::Context>, objc_class*, v8::Local<v8::Object>, tns::V8Args&, tns::MethodMeta const*, bool) + 100
3          0x1019ba984 tns::MetadataBuilder::InvokeMethod(v8::Local<v8::Context>, tns::MethodMeta const*, v8::Local<v8::Object>, tns::V8Args&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, bool) + 88
4          0x1019ba210 tns::MetadataBuilder::MethodCallback(v8::FunctionCallbackInfo<v8::Value> const&) + 220
5          0x101b23e10 v8::internal::FunctionCallbackArguments::Call(v8::internal::CallHandlerInfo) + 536
6          0x101b233dc v8::internal::MaybeHandle<v8::internal::Object> v8::internal::(anonymous namespace)::HandleApiCallHelper<false>(v8::internal::Isolate*, v8::internal::Handle<v8::internal::HeapObject>, v8::internal::Handle<v8::internal::HeapObject>, v8::internal::Handle<v8::internal::FunctionTemplateInfo>, v8::internal::Handle<v8::internal::Object>, v8::internal::BuiltinArguments) + 516
7          0x101b22b7c v8::internal::Builtin_Impl_HandleApiCall(v8::internal::BuiltinArguments, v8::internal::Isolate*) + 224
8          0x1022b4d8c Builtins_CEntry_Return1_DontSaveFPRegs_ArgvOnStack_BuiltinExit + 108
9          0x10224d6b4 Builtins_InterpreterEntryTrampoline + 244
10         0x10224d6b4 Builtins_InterpreterEntryTrampoline + 244
11         0x10224d6b4 Builtins_InterpreterEntryTrampoline + 244
12         0x10224d6b4 Builtins_InterpreterEntryTrampoline + 244
13         0x10224d6b4 Builtins_InterpreterEntryTrampoline + 244
14         0x10224d6b4 Builtins_InterpreterEntryTrampoline + 244
15         0x10224d6b4 Builtins_InterpreterEntryTrampoline + 244
16         0x10224d6b4 Builtins_InterpreterEntryTrampoline + 244
17         0x10224d6b4 Builtins_InterpreterEntryTrampoline + 244
18         0x10224d6b4 Builtins_InterpreterEntryTrampoline + 244
19         0x102246504 Builtins_ArgumentsAdaptorTrampoline + 228
20         0x10224d6b4 Builtins_InterpreterEntryTrampoline + 244
21         0x10224d6b4 Builtins_InterpreterEntryTrampoline + 244
22         0x10224d6b4 Builtins_InterpreterEntryTrampoline + 244
23         0x10224d6b4 Builtins_InterpreterEntryTrampoline + 244
24         0x10224af64 Builtins_JSEntryTrampoline + 164
25         0x10224ac08 Builtins_JSEntry + 168
26         0x122ac4000 26  ???                                 0x0000000122ac4000 0x0 + 4876681216
JavaScript stack trace:
at _removeViewFromNativeVisualTree (file: app/packages/core/ui/core/view/index.ios.ts:787:29)
at _tearDownUI (file: app/packages/core/ui/core/view-base/index.ts:871:15)
at <anonymous> (file: app/packages/core/ui/core/view-base/index.ts:865:9)
at eachChildView (file: app/packages/core/ui/layouts/layout-base-common.ts:125:18)
at eachChild (file: app/packages/core/ui/core/view/view-common.ts:867:7)
at _tearDownUI (file: app/packages/core/ui/core/view-base/index.ts:864:7)
at <anonymous> (file: app/packages/core/ui/core/view-base/index.ts:865:9)
at eachChildView (file: app/packages/core/ui/layouts/layout-base-common.ts:125:18)
at eachChild (file: app/packages/core/ui/core/view/view-common.ts:867:7)
at _tearDownUI (file: app/packages/core/ui/core/view-base/index.ts:864:7)

Originally posted by @romandragan in https://github.com/NativeScript/NativeScript/issues/8867#issuecomment-698143588