Add warning regarding cancellation

Author: glopesdev

articles/reactive-sink.md

@@ -9,3 +9,6 @@ The `Sink` operator uses the nested workflow to specify a reactive operation ove
 
 > [!Tip]
 > `Sink` operators are very useful to prevent side-effects from affecting the source sequence. Even if the inner sequence terminates early, or changes the timing of emitted values, these effects will not propagate to the outer sequence.
+
+> [!Warning]
+> If the source sequence terminates, the subscription to the nested sequence will be cancelled. If the reactive operation needs to be fully asynchronous and decoupled from the main sequence, consider using @subjects to process items in a separate branch of the workflow.