Share your thoughts on DirectQuery for Power BI datasets and Azure Analysis Services (preview)

We have been losing the custom 'Sort by column' configuration and data types reverting back to default (ie from numeric to text).  This has been causing a lot of frustration and mysterious bugs over the last few weeks and I've seen a few posts alluding to it being caused by this preview feature. 

Can someone confirm this is a known issue and when it is expected to be resolved?