Version Used:
Version 17.7.0 Preview 2.0

Steps to Reproduce:

1. Add end_of_line = lf to .editorconfig

[*.cs]
end_of_line = lf

2. Paste the following to Program.cs

var s = new StringBuilder();
s.Append($"{123}");

3. Paste the following to Program.cs

Console.WriteLine(Regex.Match("", "").Success);

var buffer = (stackalloc byte[32]);
Utf8Formatter.TryFormat(123, buffer, out var bytesWritten);

Expected Behavior:

All newlines are LF.

Actual Behavior:

Perhaps the reason for this is that CSharpAddMissingImportsFeatureService does not use IndentBlockFormattingRule.WithOptions(SyntaxFormattingOptions).

https://github.com/dotnet/roslyn/blob/main/src/Features/CSharp/Portable/AddImport/CSharpAddMissingImportsFeatureService.cs#L31