`dotnet --debug` switch no longer works (unix)

When we now try to run our `--debug` flag as defined by `src/Cli/Microsoft.DotNet.Cli.Utils/DebugHelper.cs`, the flag doesn't work and we get a failure with:

`./artifacts/bin/redist/Debug/dotnet/dotnet --debug --info`
```
Could not execute because the specified command or file was not found.
Possible reasons for this include:
* You misspelled a built-in dotnet command.
* You intended to execute a .NET program, but dotnet---debug does not exist.
* You intended to run a global tool, but a dotnet-prefixed executable with this name could not be found on the PATH.
```

However, it seems that skipping the native host resolution re-enables the flag to work:
`./artifacts/bin/redist/Debug/dotnet/dotnet exec ./artifacts/bin/redist/Debug/dotnet/sdk/10.0.103-dev/dotnet.dll --debug --info`

My understanding is that there was some change to the host that caused this. I thought it was the tool lookup logic or the `-` conversion lookup, but I'm not sure.

Maybe I'm also doing something wrong but it seems busted to me. Seems like it may be a linux issue, so it may also have never worked on unix.