sourceName forms not working

### Product

dotnet CLI (dotnet new)

### Describe The Bug

According to https://github.com/dotnet/templating/wiki/Naming-and-default-value-forms, sourceName should be possible to be transformed using a predefined "namespace" form. Unfortunately this doesn't seem to be the case.

Take for example "sourceName" : "Re.Pro"
According to the documentation, using Re._Pro should result in the namespace transform. But this transform doesn't happen.

When running `dotnet new repro -n Some-Name`

"Re._Pro" in solution files does not get replaced
"Re._Pro" in folder names does not get replaced
Indeed, "Re._Pro" is not replaced anywhere, as far as I tried.

See the attached template for reproduction.

Alternatively, "Re.Pro" **is** replaced, but the way the engine chooses the values it is replaced with is arcane to me.
When running `dotnet new repro -n Some-Name`

"Re.Pro" in the solution file gets replaced with "Some_Name"
"Re.Pro" in folder names gets replaced with "Some-Name"

The result is a solution file targeting a project in the "Some_Name" directory, but the directory is actually called "Some-Name" .

### To Reproduce

Steps:
1. Download Repro.zip and extract the template
2. dotnet new install [path-to-repro-template]
3. dotnet new repro -n Some-Name
[Repro.zip](https://github.com/dotnet/templating/files/12027398/Repro.zip)

### dotnet Info

output
.NET SDK:
Version: 7.0.203
Commit: 5b005c19f5

Runtime Environment:
OS Name: Windows
OS Version: 10.0.22000
OS Platform: Windows
RID: win10-x64
Base Path: C:\Program Files\dotnet\sdk\7.0.203\

Host:
Version: 7.0.5
Architecture: x64
Commit: 8042d61b17

.NET SDKs installed:
3.1.426 [C:\Program Files\dotnet\sdk]
6.0.313 [C:\Program Files\dotnet\sdk]
7.0.202 [C:\Program Files\dotnet\sdk]
7.0.203 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.15 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.18 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 7.0.4 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 7.0.5 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.15 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.18 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.4 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 6.0.12 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 6.0.15 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 6.0.18 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 7.0.4 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 7.0.5 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Other architectures found:
x86 [C:\Program Files (x86)\dotnet]
registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]

Environment variables:
Not set

global.json file:
Not found

Learn more:
https://aka.ms/dotnet/info

Download .NET:
https://aka.ms/dotnet/download

### Visual Studio Version

_No response_

### Additional context

_No response_