Site Map: adding a New Section generates two references/icons of the same new node if the page is not refreshed manually.

Hi all,

Tested both on local site upgraded from OA 2.44 to 2.45 and on a fresh standard install of OA 2.45 on Pantheon.

Issue:
On Site Map web page I noticed that (happens since at least OA 2.43), after creating a new Section through the Sitemap "+" New Section action, this new Section is visualized (circle icon) on the Site Map two times before the web page is manually refreshed (which shouldn't be necessary); this happens no matter if this new Section is the very first one or is added to others yet available on that Space and it is unrelated to the Type of Section chosen.
It looks like a cache issue on the web browser (or the lack of an automatic web page reload just after the action is submitted).

Notes:
The message "Section Page xxxxxx has been created." will appear only after the web page is manually reloaded.
The issue doesn't happen once the Site Map page is reloaded manually the first time.
After the Site Map web page reloads link to the new node (Section) is in the form /spacename/sectionname (e.g /backoffice/calendar), before the web reload link is in the form /node/nodenumber (e.g. /node/102)...but, in both cases, link works.

How to reproduce:

1. As Admin (or other user with proper OG permissions/role rights) add a Space
2. Add a Section with "+" New Section button
3. Fill required information (select a Section Title, a Section Type - I tested all Section Types - and leave Section Visibility values default) and just Publish

Expected result:
Only one section icon will appear on the Site Map (before any web browsing reload of the page).

Obtained result:
Two Section icons will appear on the Site Map, both pointing to the same new Node (before any web browsing reload of the page).

If the Site Map web page if refreshed manually after that the expected result is obtained and Issue doesn't happen anymore.