Unhandled exception rendering component: '<' is an invalid start of a value for Blazor WASM

I have an API endpoint which allows anonymous. I have confirmed in Postman it is working for anonymous and authenticated users and returning proper JSON.

Because the endpoint can be called anonymously, in my Blazor WASM http Service, I have constructed the following, one request to send without a token, one request to send with a token.

private readonly HttpClient httpClient;
private readonly IHttpClientFactory httpClientFactory;
private readonly HttpClient anonHttp;

public CommunityHttpService(HttpClient httpClient, IHttpClientFactory httpClientFactory)
{
   if (httpClient == null) throw new ArgumentNullException("Http is null.");
   this.httpClient = httpClient;
   this.httpClientFactory = httpClientFactory;
   anonHttp = httpClientFactory.CreateClient("AnonAPI");
}

public async Task<HttpResponseMessage> GetCommunity(Guid communityId, bool userIsAuthenticated)
{
    if (!userIsAuthenticated)
    {
       // make anonymous api call without bearer token to avoid error
       return await anonHttp.GetAsync($"api/communities/GetCommunity/" + communityId);
    }
    else
    {
       return await httpClient.GetAsync($"api/communities/GetCommunity/" + communityId);
     }
}

I declare the Community in my component.

private CommunityDto Community { get; set; } = new CommunityDto();

in my OnInitializedAsync method of the component, I have the following:

if (!string.IsNullOrEmpty(CommunityId.ToString()))
{
    var authState = await AuthenticationStateProvider.GetAuthenticationStateAsync();
    var user = authState.User;
    HttpResponseMessage apiResponse;
    if (user.Identity.IsAuthenticated)
    {
       apiResponse = await CommunityService.GetCommunity(CommunityId, true);
    }
    else
    {
      apiResponse = await CommunityService.GetCommunity(CommunityId, false);
    }

    if (apiResponse.IsSuccessStatusCode)
    {
        Community = await apiResponse.Content.ReadFromJsonAsync<CommunityDto>();
    }
}

All the html is:

<span>@CommunityId</span>

Setting breakpoints seems to be useless, but I don't know what could be causing this error in the console. Any ideas?