[thegooddoctor]

Playing H-OU MKV and not being properly recognized as 3D (3D MVC MKV recognized fine); this is not the problem.

You will need to name these files correctly. Ensure filename contains ".3D.TAB." in filename. See:
http://kodi.wiki/view/3D#Video_filenames_flags

I knew about this (used this in Kodi 16) but found that recently my 3d MVC MKV's didn't require the additional file name information. Just started trying out 3D TAB MKV's and it seems that those files require the additional filename information.

Subs are permanently being rendered regardless if subs turned on or off. Playing the same media in a different player has no subs (subs are not hard coded).

Can you check with kodi on another platform - e.g. a Krypton build for Windows?

Just tried Kodi 17 nightly build for Windows (http://mirrors.kodi.tv/nightlies/win32/K...master.exe) and the bug is there as well.
Who needs to be notified then regarding this bug since this is not build dependent?