FilePicker on iOS: double quotes (0x22) in picked json file replaced by 0xAB («) the 1st time it is opened+read

[softlion]

Description

When using FilePicker on iOS to pick a json file, on a real device, the 1st time the file is picked its text content is not the original content. Instead every double quotes are replaced into the '«' char, and spaces after that char is replaced by a non breaking space (NBSP, 0xA0).

If picking the same file a second time, it is loaded as expected, its content is the original unchanged one: with normal double quotes and normal spaces.

On Android there is no issue, everything is working as expected the 1st time.
That code is upgraded from a Xamarin app, and is working perfectly on iOS with the Xamarin version of the app.

Steps to Reproduce

Also, I tried to use UIType.Json in the code below instead of "public.json" but UIType can't be found in net8 ? Any clue ?

            var options = new PickOptions
            {
                PickerTitle = "Select a file to import",
                FileTypes = new (
                    new Dictionary<DevicePlatform, IEnumerable<string>>
                    {
                        { DevicePlatform.Android, new [] { "application/json", "application/javascript", "application/octet-stream"} },
                        { DevicePlatform.iOS, new [] { "public.json", "public.text" } }, 
#if IOS
                        //(string) UIType.Json: used in maui, but not available otherwise ?!
#endif
                    }),
            };
                
            var fileData = await FilePicker.PickAsync(options);
            if (fileData != null)
            {
                AppSettingsFileName = fileData.FileName;
                await using var stream = await fileData.OpenReadAsync();
                using var reader = new StreamReader(stream);
                var content = reader.ReadToEnd();

                //examine content here. Only the 1st time the file is opened, it will contain those chars.
               //content[4] will be '«' (0xAB) instead of " (double quote 0x22)
               //content[5] will be NBSP (0xA0) instead of a space 0x20
               //the second time the same file is picked, the content is the regular content (ie: normal spaces and double quotes)
            }

Link to public reproduction project repository

No response

Version with bug

8.0.21 SR4.1

Is this a regression from previous behavior?

Yes, this used to work in Xamarin.Forms

Last version that worked well

Unknown/Other

Affected platforms

iOS

Affected platform versions

17.4.1

Did you find any workaround?

No.

Relevant log output

No response

[softlion]

Original file:

Content loaded the 1st time the picker is used. Remark the quotes transformed into another char.

Related source code from maui:

https://github.com/dotnet/maui/blob/main/src/Essentials/src/FileSystem/FileSystem.ios.cs

[softlion]

The above content was on iPad. I tested on iPhone, and the "char transformation" is not the same!

Double quotes are replaced by those curious chars:

For example that char: “ is the E2 80 9C sequence.

[jaosnz-rep]

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