Page title contains the dots (..) then it shows different name into Page Tree

Issue Summary

If the Page title contains the dots (..) in the Page title it shows a different name in Page Tree
$htmlUtil.htmlEncode($content.displayTitle).

This is reproducible on Data Center: yes

Steps to Reproduce

1. Create a fresh instance with Confluence 8.5.5
2. Create test space
3. Create a test page with title : test.. or .. (double dots)
4. Shows the weird title for the Page in the Page tree $htmlUtil.htmlEncode($content.displayTitle).

Expected Results

It should show the same Page title in the Page Tree as that of actual Page.

Actual Results

Page Tree shows "$htmlUtil.htmlEncode($content.displayTitle)."

Workaround

Reove the (..) from the Page title, it will fix the Page tree issue.