Manual registration of generic handler works, but automatic doesn't.

[matteo-mosca]

If I make the following registration:

builder.Services.AddScoped<IRequestHandler<CreateCommand<CreateClientDto, ClientEntity>, Result<ClientEntity>>, CreateHandler<CreateClientDto, ClientEntity>>();

Then at runtime everything is resolved and works. But if I leave it to automatic registration with RegisterGenericHandlers = true I have some weird error (namespaces redacted for brevity, everything is in the same assembly):

System.InvalidOperationException: No service for type 'MediatR.IRequestHandler2[CreateCommand2[CreateClientDto,ClientEntity],Result1[ClientEntity]]' has been registered.`

Which is extremely weird, because manual registration of the very same works.

Am I missing something? I can provide more code if anyone thinks it matters, I honestly think it doesnt, like my classes implementations and such.