Code inspection: Conditional access qualifier expression is known to be null or not null

This inspection reports a conditional access expression when the qualifier is already known at that exact program point. In practice, the analyzer has proved that the qualifier is definitely non-null or definitely null, so ?. no longer expresses a real condition.

This most often happens after control-flow has already established the value is non-null, or when ?. is used on a non-nullable value type result.

When the qualifier is definitely null, the whole conditional access is effectively dead code and should usually be rewritten or removed.