When overriding `br/public` with private ACR intellisense for available modules doesn't work

**Bicep version**
`Bicep CLI version 0.39.26 (1e90b06e40)`

**Describe the bug**
When overriding `br:public` with private ACR intellisense for available modules doesn't work.

`bicepconfig.json` example:
```json
{
"moduleAliases": {
"br": {
"public": {
"registry": "bcpavminnersourcedemo-aahydgfpgce4ebcj.azurecr.io",
"modulePath": ".."
}
}
}
}
```

Works when calling the private ACR directly:

Doesn't work when overriding `br/public`:

Start by reproducing the issue with the provided bicepconfig.json moduleAliases override and compare IntelliSense behavior for the private ACR reference versus br/public. Trace the module alias and available-module IntelliSense paths; done means private ACR modules appear when br/public is overridden.

Written by the indexing model from the issue text.