[8.10] [DOCS] Adds #160116 known issue to 8.9 release notes (#166371) (…

…#166452)

# Backport

This will backport the following commits from `main` to `8.10`:
- [[DOCS] Adds #160116 known issue to 8.9 release notes
(#166371)](#166371)

<!--- Backport version: 8.9.7 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT [{"author":{"name":"Kaarina
Tungseth","email":"[email protected]"},"sourceCommit":{"committedDate":"2023-09-14T12:42:05Z","message":"[DOCS]
Adds #160116 known issue to 8.9 release notes (#166371)\n\nAdds #160116
known issue to 8.9 release
notes.","sha":"7010742461a3e974f918d10bc181c4737aa08edd","branchLabelMapping":{"^v8.11.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["Team:Docs","release_note:skip","v8.9.0","v8.11.0","v8.10.1"],"number":166371,"url":"https://github.com/elastic/kibana/pull/166371","mergeCommit":{"message":"[DOCS]
Adds #160116 known issue to 8.9 release notes (#166371)\n\nAdds #160116
known issue to 8.9 release
notes.","sha":"7010742461a3e974f918d10bc181c4737aa08edd"}},"sourceBranch":"main","suggestedTargetBranches":["8.9","8.10"],"targetPullRequestStates":[{"branch":"8.9","label":"v8.9.0","labelRegex":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"},{"branch":"main","label":"v8.11.0","labelRegex":"^v8.11.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/166371","number":166371,"mergeCommit":{"message":"[DOCS]
Adds #160116 known issue to 8.9 release notes (#166371)\n\nAdds #160116
known issue to 8.9 release
notes.","sha":"7010742461a3e974f918d10bc181c4737aa08edd"}},{"branch":"8.10","label":"v8.10.1","labelRegex":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"}]}]
BACKPORT-->

Co-authored-by: Kaarina Tungseth <[email protected]>

docs/CHANGELOG.asciidoc

@@ -394,6 +394,28 @@ Discover::
 
 For information about the {kib} 8.9.0 release, review the following information.
 
+[float]
+[[known-issues-8.9.0]]
+=== Known issues
+
+// tag::known-issue-160116[]
+[discrete]
+.Changes to Lens visualizations do not appear in the saved object.
+[%collapsible]
+====
+*Details* +
+Changes to Lens visualizations do not appear in the saved object. 
+
+*Impact* +
+When you remove fields from Lens visualizations, then save your changes, the removed fields continue to appear in the Lens visualization saved objects. 
+For example, when you remove runtime fields from a Lens visualization and {kib}, then inspect the Lens visualization saved object, the runtime fields continue to appear and an error message appears.
+
+*Workaround* +
+In 8.10.0, we are addressing this issue by merging the existing and changed saved object instead of replacing the saved object.
+
+====
+// end::known-issue-161249[]
+
 [float]
 [[breaking-changes-8.9.0]]
 === Breaking changes