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

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

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