Krypton ATSC closed caption isn’t working properly

I am currently using ServerWMC as my backend for the Kodi PVR and Live TV feature on my Android TV. I used ATSC closed caption for my recorded TV shows all the time in Canada and work fine with either Kodi V16.1 and SPMC. Yet for all the Kypton beta versions that I have tried including the latest Beta 6, I couldn’t able to to make Closed Caption works. Anyone experienced similar issue? How could I start diagnostic this problem? I assume this is Krypton issue instead of ServerWMC because earlier version of Kodi works.

I want to clarified I have already ensure ‘Enable parsing for Closed Captions’ is one and from the GUI, I can choose enable CC. Yet, I don’t see the subtitle is being displayed at all.

Please advice.