Referenced resource not included in response if unsubscribed while getting ready

[jirenius]

Issue

When subscribing (directly or indirectly, through a subscribe request or a resource event) to a resource (A) that indirectly references another resource (B) that is already directly or indirectly subscribed, that child resource (B) will not be included in the client response for the subscription of the parent resource (A) if it is unsubscribe while the parent resource (A) is still not ready due to it loading other references.

Example
(Simplified without access requests)

[jirenius]

Resolved in PR #242