runtime: Inconsistent CultureInfo.DateTimeFormat.ShortestDayName between server/wasm

Describe the bug

I used CultureInfo.DateTimeFormat.ShortestDayNames in blazor project. While using en-US culture, It returns different values when using server side project or wasm project.

In wasm it returns single letter “S M T W T F S” In server-side it returns double letters “Su Mo Tu We Th Fr Sa”

This is probably a problem of mono runtime.

To Reproduce

1. Create template project for Blazor server/wasm projects respectively
2. Output DateTimeFormat.ShortestDayNames for CultureInfo en-US

Exceptions (if any)

Further technical details

• ASP.NET Core version
• Include the output of dotnet --info

.NET Core SDK (reflecting any global.json):
 Version:   5.0.100-preview.1.20155.7
 Commit:    1c44853056

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.18363
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\5.0.100-preview.1.20155.7\

• The IDE (VS / VS Code/ VS4Mac) you’re running on, and it’s version

Visual Studio Community 2019 16.6.1