Breakpoints Always Unbound in `mdbg.exe`

### Type of issue

Code doesn't work

### Description

When debugging C# applications with `mdbg.exe`, breakpoints are always unbound:

> Breakpoint #<...> unbound (line <...> in <...>.cs)

### Page URL

https://learn.microsoft.com/en-us/dotnet/framework/tools/mdbg-exe

### Content source URL

https://github.com/dotnet/docs/blob/main/docs/framework/tools/mdbg-exe.md

### Document Version Independent Id

a9a112c9-722e-f557-7935-1a0605c320ee

### Article author

@gewarren

### Metadata

* ID: 51c332c8-7b56-fdcf-f2c8-006cb54d7fb0
* Service: **dotnet-framework**

[Related Issues](https://github.com/dotnet/docs/issues?q=is%3Aissue+is%3Aopen+a9a112c9-722e-f557-7935-1a0605c320ee)