App Store review team reports 'Connection refused' error preventing image loading when using Firebase storage

I have an app published on the Apple App store, and I've been having problems getting an updated approved due to issues with loading images. The app review team claims that there are network problems inside my app that prevent images from being loaded properly. Specifically, they have mentioned that the app presents a "Connection refused" error and that content does not load properly.

The app has some social network, instagram-like functionality, allowing users to upload their content, and it's al some king of e-commerce where user can buy some training-related content like training programs or documentaries. We use Firebase as the database and storage backend, so that when the content is uploaded, a URL is generated and that URL is used to display the content later.

The screenshots the app reviewer attach are the following ones, which clearly shows how the app is capable of fetching content from Firebase database (as the grid/list is showed) but incapable of fetching the images

However, I have tested the app on multiple devices, including an iPad that I purchased specifically for testing, and have not been able to replicate the problem. Furthermore, our app's backend is Firebase, and we store all images and videos there. We have a large user base on Android, iOS, and web, and nobody has ever complained about this issue.

I have been in communication with the app review team, but their suggestions for testing and resources have not helped me to resolve the issue. I would really appreciate any suggestions or guidance that the Stack Overflow community could offer to help me identify and fix this issue.

Thanks a lot!

firebaser here

We are aware that some apps that use Firebase Storage have been rejected by Apple and we are working with Apple to help resolve the issue.

You can find more information here: App Store Rejection Due To Being Unable To Get Data From Firebase

Update: This issue should now be mitigated

If you are using https://pub.dev/packages/cached_network_image or https://pub.dev/packages/optimized_cached_image then replace it with default Image.network widget. My app was also getting rejected since many days, I was using optimized_cached_image, after using Image.network widget my app got approved.