Object/ factory with type DocumentRepo is already registered inside GetIt

[dev-horacebg]

I'm running into an interesting issue I've not been able to get to the bottom of for some time now.
Basically, the error is telling me that I've already registered an Object/ factory inside GetIt. This seems to be the case no matter how I try to prevent registerLazySingleton() from being called again.

Default implementation

GetIt locator = GetIt.instance;

DocumentDataSource documentDataSource = NetworkDocumentDataSource();

locator.registerLazySingleton(() => DocumentRepo(documentDataSource));

Provide created instance

GetIt locator = GetIt.instance;

DocumentDataSource documentDataSource = NetworkDocumentDataSource();
DocumentRepo documentRepo = DocumentRepo(documentDataSource);

locator.registerLazySingleton(() => documentDataSource);

Check if type registered

GetIt locator = GetIt.instance;

DocumentDataSource documentDataSource = NetworkDocumentDataSource();
DocumentRepo documentRepo = DocumentRepo(documentDataSource);

if (!GetIt.I.isRegistered<DocumentRepo>()) {
    locator.registerLazySingleton(() => documentRepo);
}

Check if instance registered

GetIt locator = GetIt.instance;

DocumentDataSource documentDataSource = NetworkDocumentDataSource();
DocumentRepo documentRepo = DocumentRepo(documentDataSource);

if (!GetIt.I.isRegistered<DocumentRepo>(instance: documentRepo)) {
    locator.registerLazySingleton(() => documentRepo);
}

I can't see why I'd get this issue again with either of the last two checks. Am I missing something obvious here? Any pointers?

I know there have been a number of similarly titled issues raised in the past but I'm struggling to see what I need to do here to stop this from happening.

This happens on the latest version:7.2.0 and other historic versions we've used in the past.

[dev-horacebg]

Querying the locator instance I created directly did the job 😓

if (!locator.isRegistered<DocumentRepo>()) {
    locator.registerLazySingleton(() => documentRepo);
}

[escamoteur]

That is pretty weird. So you say if you use locator it worked but if you used GetIt.I it didn't?

could you give me a simple repro project that shows the effect?