Issue with SSR content flashing/flickering during initial load

[Santiago Fierro (SEDICI)]

Dear Dspace Technical Team, I am writing to share an issue we are experiencing with the DSpace-Angular (Version 9.2) user interface regarding the Server-Side Rendering (SSR) to Client-Side transition. Currently, when running the application in production mode, the initial SSR content completely disappears for a moment before being replaced by the Client-Side Rendering (CSR) content. This causes a very noticeable "flicker" or "flash" of a blank screen during the initial load. I have seen similar issues mentioned in the past (), but it seams to be related to specific section (/search). However, we have observerded that this happens on all pages with SSR whenever they are accessed directly (e.g., via a hard refresh or direct URL navigation). This includes the Item view, Community and Collection views, the Home page and others. In order to reproduce, go to any page on a production instance (production mode), such as  and wait for it to be fully loaded. You will see the page load as expected at first (from the server), then completely disappear for a moment, and finally it will be loaded again. The expected behavior would be a seamless visual transition from SSR to CSR without the content disappearing. Is anyone aware of this issue, or is there any ongoing work/workaround to solve this issue? Thank you very much for your time. Best regards, Santiago.