Suggested solution to SYSLIB1054 results in compiler error CS8796

[Aniobodo]

Version Used:
.NET SDK 9.0.200

Repro:

using System.Runtime.InteropServices;

namespace ConsoleApp1;
public static class InfoBox
{
    [DllImport("user32.dll", CharSet = CharSet.Unicode)]
    static extern int InfoBoxA(nint hWnd,
        string lpText,
        string lpCaption,
        uint uType);
}

Steps to Reproduce:

1. Create a project with the above repro in Visual Studio 2022.
2. SYSLIB1054: Respond to the Quick Action tip (Yellow light bulb) on the method by accepting the suggestion.
3. Recognise the new error CS8796

2025-03-05.Accepting.the.suggestion.from.Quick.Action.tip.results.in.compiler.error.CS8796.mp4

Diagnostic Id:
CS8796

Expected Behavior:
No error if Quick Action suggestion is accepted

Actual Behavior:
Accepting the suggestion from Quick Action tip results in compiler error CS8796

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I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

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[stephentoub]

The fixer should be adding a visibility modifier to the generated partial.