Hi Olga, sure, kindly refer to below:
At first, I thought that I had accidentally unchecked the subtitle in the "Select stream" dialog window, as there's no display of the subtitle when I play it - until I check as my screenshot, and realize that the subtitle is there, just not set as default like the original mkv.
It will be great if this problem could be fixed, as it's annoying that you have to choose (tick) the subtitle every time when you play it, o(โฏโกโฐ)o~
Thank you! ^ ^