Hi all, we had an issue with using feature flags. 
We apply the code and expect to read all features and the labeled should always override the null labeled one.
.UseFeatureFlags(featureFlagOptions =>
{
featureFlagOptions.Label = LabelFilter.Null;
}).UseFeatureFlags(featureFlagOptions =>
{
featureFlagOptions.Label = label;
})
And as a result, we had a dynamic response from the feature manager with
During the first call, we had the label value, but then all the rest calls we had only null labeled values