Wrong notification behaviour when subscribing both with `CollectionChanged` and `SubscribeForNotifications`

[papafe]

How to reproduce:

• Use the following test:

https://github.com/realm/realm-dotnet/blob/521d915aed3399b5d835200e00be7c9c2594c37b/Tests/Realm.Tests/Database/NotificationTests.cs#L881-L922

• Add container.Items.SubscribeForNotifications((s, c) => { }); after the other subscriptions

Result: the test does not pass because a Replace notification is called when we modify an object, and the penultimate assertion is false

[sync-by-unito[bot]]

➤ PM Bot commented:

Jira ticket: RNET-1152

[papafe]

I think this is due to the caching we do for notifications