New iPhone 15 Pro is not downloading all photos from Cloud

Hello!

I have set up a new iPhone 15 Pro last week (Friday).

Since then, everything is installed and working, except the photos. On all of my iPhones, I was downloading all the photos os iCloud, so I set this one to do the same.

Unfortunately, it got stuck in "Downloading" since then, with no progress.

What is happening is that some of the photos have been downloaded, but most of them have not. I have around 20k photos and videos. The ones that are not downloaded look like black photos with a cloud logo on them. If I open an empty photo, it gets downloaded. Even if I scroll between the gallery, some of them get downloaded, but I can't do that for 20k items.

What I have tried since Friday (5 days ago):

• Stayed connected to Wi-Fi and power during all nights
• Deactivated syncing which deleted all my photos on my iPhone, restarted the process
• Created a shortcut that takes image by image as seen in another post as a suggestion - after a few hours of running, not even a folder of 1k photos was downloaded.

I am adding some screenshot that describe the situation better.

Any solution?

Thanks