Some APIs not showing in API Center after applying a filter

# Description

I have an API Center resource with several APIs, but after applying a filter (by API type), I don't see the expected results, and most of my APIs fail to be retrieved.

# Reproduction steps

_Note! I have APIs which I added through the VS Code extension following [these instructions](https://azure-samples.github.io/API-Center-Workshop/docs/develop/inventory/register-apis), and most which I added by importing from APIM, also following [these instructions](https://azure-samples.github.io/API-Center-Workshop/docs/develop/inventory/import-from-apim)._

Steps to reproduce the behavior:

1. Follow the API Center workshop steps until the [Register your APIs](https://azure-samples.github.io/API-Center-Workshop/docs/develop/inventory/register-apis) step
2. At this point, Contoso APIs should be registered in the API Center
3. Complete [import APIs from APIM](https://azure-samples.github.io/API-Center-Workshop/docs/develop/inventory/import-from-apim) step
4. Refresh your API Center to view all APIs
5. Filter by API type: REST (all other filters seem to work)
6. See unexpected behavior

# Expected behavior

Almost all my APIs are of type REST, so I expect them to show up after I apply the filter

# Actual behavior

Only the APIs that I added through the extension show up in the search result after applying the filter

# Screenshots


# Additional context

None