Xwiki 9.4. Failed to save the page. Reason: Server not responding

Hello,

I have some problem, when create new page from Templates. I get an error

Failed to save the page. Reason: Server not responding

whatever I would not click Save&Continue or Save&View

The page is saved in any case, but with an error. If you close the page and open it again and continue editing, the page is saved without problems.

Xwiki 9.4. Installed from the WAR file