✅ Project A sees one class in Project B, but not both (C#)

I have two C# projects. In one, I declare two classes. One just derives from the other and adds some extra fields. The other project needs to use those classes. The dependant project can reference the base class just fine. But not the derived class. For that, VS 2022 Community insists the derived class doesn't exist. What gives? I keep checking the dependancy references. Those are good.

C#
private readonly System.Collections.Generic.SortedDictionary<string, Data.Defs.UserNetwork>
    mapAllNetworksSortedByName = new();

private readonly System.Collections.Generic.SortedDictionary<string, Data.Defs.Network>
    mapAllPredefinedNetworksSortedByName = new();

C#
namespace BestChat.IRC.Data.Defs
{
    public class UserNetwork : Network
    {
.
.
.

C#
namespace BestChat.IRC.Data.Defs
{
    public class Network
.
.
.
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