[OSDOCS-16093]: Adding known issue to HCP release notes

Author: lahinson

hosted_control_planes/hosted-control-planes-release-notes.adoc

@@ -131,6 +131,8 @@ $ oc get agents -A
 
 * When you use the console or API to specify an IPv6 address for the `spec.services.servicePublishingStrategy.nodePort.address` field of a hosted cluster, a full IPv6 address with 8 hextets is required. For example, instead of specifying `2620:52:0:1306::30`, you need to specify `2620:52:0:1306:0:0:0:30`.
 
+* In {hcp} on {VirtProductName}, if you store all hosted cluster information in a shared namespace and then back up and restore a hosted cluster, you might unintentionally change other hosted clusters. To avoid this issue, back up and restore only hosted clusters that use labels, or avoid storing all hosted cluster information in a shared namespace.
+
 [id="hcp-tech-preview-features_{context}"]
 === General Availability and Technology Preview features