Invalid implicit enum value for unordered items

[mmusu3]

Input code

class EnumOrderTest
{
    enum EnumA
    {
        Item1 = 1,
        Item0 = 0
    }

    enum EnumB
    {
        Item1 = 1,
        Item0
    }

    void Test()
    {
        // This is expected to fail since EnumB.Item0 is compiled with a value of 2 following Item1.
        System.Diagnostics.Debug.Assert((int)EnumA.Item0 == (int)EnumB.Item0);
    }
}

Erroneous output

#define DEBUG
using System.Diagnostics;

internal class EnumOrderTest
{
	private enum EnumA
	{
		Item1 = 1,
		Item0 // Will be implicitly assigned the value '2'
	}

	private enum EnumB
	{
		Item1 = 1,
		Item0
	}

	private void Test()
	{
		Debug.Assert(condition: false);
	}
}

When recompiled EnumA.Item0 will have the value 2 instead of 0.

Details

Tested with ILSpy at commit d91732f.
Input code compiled in debug mode to retain the Assert.
This is a regression from when I last tested. I was previously using commit d69137a.