### Check for existing issues

- [x] I have searched the existing issues and checked that my issue is not a duplicate.

### What happened?

I updated my LiteLLM proxy image to 1.90.0, and i started getting messages about models not being found in the cost map. With 1.85.3 and the same configuration, I do not get these warnings. From this I can only conclude that something broke in in that time.

### Steps to Reproduce

My configuration looks like this:

``` model_list: - model_name: indexing litellm_params: model: azure/my-deployment-name litellm_credential_name: azure model_info: base_model: azure/text-embedding-3-large supported_environments: - production - staging ``` and then (currently) the same for the environment `development`, and (twice) three more models configured along the same lines. With 1.85.3, I just get a warning that either development or staging/production models are ignored (from router.py:7090). With 1.90.0, I get warnings that the models lack cost information and cannot be registered.

### Relevant log output

```shell {"message": "register_model: model=301c565873ae83ae769025bcba2e69e1f83731ad64be0f1a1900b993…