K13: Cache items not showing up in debug

Hi, I'm on v13.0.154. I'm trying to debug my output cache but the cache items don't show up:

The code used to generate the cache is here:

public async Task<IEnumerable<ListableDocumentRollupItemModel>> GetListableDocumentRollupItemsAsync(string path, IEnumerable<string> categories, IEnumerable<string> categoriesExclude, string classNames, int maxRelativeLevel, int topN, string orderBy, int page, int pageSize)
{

    var categoriesStr = "";
    if (categories != null)
        categoriesStr = string.Join(";", categories);
    path = path.TrimEndForPath();

    var builder = new CacheDependencyKeysBuilder(_siteRepository, _cacheDependenciesStore);
    builder.PagePath(path, PathTypeEnum.Children);

    var retriever = await _pageRetriever.RetrieveMultipleAsync(
        query => {
            query
            .PathForChildren(path)
            .Page(page, pageSize)
            .Types(classNames)
            .TopN(topN)
            .NestingLevel(maxRelativeLevel)
            .InCategories(categoriesStr)
            .Where(GetWhereCondition(categoriesExclude))
            .Columns(GetColumns(classNames))
            .OrderBy(GetOrderBy(orderBy, classNames));
        },
        cacheSettings => cacheSettings
            .Dependencies((items, csbuilder) => builder.ApplyDependenciesTo(dependencyItem => csbuilder.Custom(dependencyItem)))
            .Key($"{nameof(GetListableDocumentRollupItemsAsync)}|{path}|{classNames}|{categoriesStr}|{page}")
            .Expiration(TimeSpan.FromMinutes(Constants.CACHE_MINUTES))
        );


    return retriever.Select(x => _mapper.Map<ListableDocumentRollupItemModel>(x));
}