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Should().Be() is claiming that objects aren't equal even though they should be equal

See original GitHub issue

Description

When running my test I’m getting the following error

  Message: 
    Expected SauceOptions.BrowserName to be chrome, but found chrome.
  Stack Trace: 
    LateBoundTestFramework.Throw(String message)
    TestFrameworkProvider.Throw(String message)
    DefaultAssertionStrategy.HandleFailure(String message)
    AssertionScope.FailWith(Func`1 failReasonFunc)
    AssertionScope.FailWith(Func`1 failReasonFunc)
    AssertionScope.FailWith(String message, Object[] args)
    ObjectAssertions.Be(Object expected, String because, Object[] becauseArgs)
    SauceOptionsTests.UsesLatestChromeWindowsVersionsByDefault() line 29

[Description of the issue]

Complete minimal example reproducing the issue

[TestMethod]
public void UsesLatestChromeWindowsVersionsByDefault()
{
    SauceOptions = new SauceOptions();
    SauceOptions.BrowserName.Should().Be(Browser.Chrome);
}

public class SauceOptions
{
    private Browser _browserName = Browser.Chrome;
    public Browser BrowserName 
    { 
        get
        {
            return _browserName;
        }
    }
}

Expected behavior:

For the test to pass and assert true

Actual behavior:

Failure with message

  Message: 
    Expected SauceOptions.BrowserName to be chrome, but found chrome.
  Stack Trace: 
    LateBoundTestFramework.Throw(String message)
    TestFrameworkProvider.Throw(String message)
    DefaultAssertionStrategy.HandleFailure(String message)
    AssertionScope.FailWith(Func`1 failReasonFunc)
    AssertionScope.FailWith(Func`1 failReasonFunc)
    AssertionScope.FailWith(String message, Object[] args)
    ObjectAssertions.Be(Object expected, String because, Object[] becauseArgs)
    SauceOptionsTests.UsesLatestChromeWindowsVersionsByDefault() line 29

Versions

Which version of Fluent Assertions are you using? 5.9.0
Which .NET runtime and version are you targeting? E.g. .NET framework 4.6.1 or .NET Core 2.1. .NET Core 3.0