Next.js 14 App Router. UI not updating but correct compiled output

Depending on your skill-set of investigation debugging, root cause analysis, solutions finding, etc. the length of the project could be as low as several minutes only. I need from you very little of your time. It is likely a very straight-forward project but will require remote-desktop screen sharing so you can see my screen because of a localhost:3000 and real domain is not live yet. I need an experienced Next.js developer to investigate via remote desktop screen sharing why my Next.js 14.2.35 App Router production application is rendering old UI despite confirmed correct source code and compiled output. This is an investigation and written report only - you will NOT make any code changes yourself. You will identify the exact root cause and document it precisely in writing so I can pass the findings to my AI coding assistant to implement the fix. Confirmed facts you should know before applying: Source files contain the new UI code (verified) Compiled chunks contain the new strings (verified by searching .next output) React hydration errors #418/#423 were present and have been fixed staleTimes set to 0, Cache-Control set to max-age=0 must-revalidate Problem persists in fresh incognito windows on both Firefox and Chrome Problem occurs on four specific page locations Your deliverable: A written report identifying the exact cause and the exact fix needed, so it can be passed to an AI assistant for implementation. No code changes by you. Important: Must be willing to do remote desktop session via screen sharing. Investigation only, no code changes. Note: I have zero knowledge about those technical subjects, I even copied pasted this description from AI, so there is significant likelihood that I personally won't be able to answer any question, particularly not technical, on my own. I expect your agreement that I copy your written question to AI (Claude) and show you on screen sharing session the answer you are looking for. As I said, project to investigate the problem seems to be very short one, so please keep in mind this that your required budget will probably be very small too. I need minimum of your time, just to check the problem and write a report what is wrong, what is the cause, how to solve it, etc. so AI (Claude) can then write a prompt for Claude Code to fix the problem.