[7.12] [DOCS] Adds dashboard known issue (elastic#129656)

Co-authored-by: Kibana Machine <[email protected]>

Author: KOTungseth

docs/CHANGELOG.asciidoc

@@ -71,6 +71,12 @@ Affected versions include {kib} 7.12.0 and earlier.
 *Solution* +
 If you are using {kib} webhook actions, upgrade to 7.12.1.
 
+[float]
+[[known-issue-7.12.1]]
+=== Known issues
+
+There are no known issues for the 7.12.1. Before you upgrade, review the <<known-issue-v7.12.0,Known issue for 7.12.0>>.
+
 [float]
 [[breaking-changes-7.12.1]]
 === Breaking changes
@@ -145,6 +151,15 @@ Security::
 
 For information about the {kib} 7.12.0 release, review the following information.
 
+[float]
+[[known-issue-v7.12.0]]
+=== Known issue
+
+Dashboard:: 
+If you are using {kib} 7.9.x and earlier, and you upgrade to 7.10.0 to 7.17.2, all hidden panel titles now appear on your dashboards.
++
+To resolve the known issue, upgrade to {kib} 7.17.3 or later. 
+
 [float]
 [[breaking-changes-7.12.0]]
 === Breaking changes