I have the following property, which will sometimes be null during the cleanup and closing of my application.

class Provider
{
    public EventsContainer Events => condition ? m_eventsContainer : null;
    ...
}

I want to unsubscribe from an event delegate, only if the object exists.

However, attempting to do

void OnDisable()
{
    m_provider.Events?.OnEventInvoked -= Funtion;
}

Raises this error

Compiler Error CS0079: The event ‘OnEventInvoked’ can only appear on the left hand side of += or -=

To me, it seems like it already is “on the left hand side of += or -=”.

Currently my workaround is to create a local copy of the object.

if (m_provider.Events is { } events)
    events.OnEventInvoked -= Funtion;

But this is of course not ideal.

My question is, why am I getting this error (the error message seems incorrect to me) and is there a better way to work around or avoid this issue.