3D with ISO

Hi,

For years i used an Mede8tor for playing my videos, now i switched to KODI 18.2 ón Fire TV Stick.
Most things work perfect.
My problem is playing 3D with ISO-files. They do not work even if i choose manually SBS or TBS .
MKV-Files work perfect with 3D.
They all worked on Mede8tor, so it is not a problem of the source files.

Is this a problem of KODI in Fire TV Stick or do I something wrong ?

Whats the easiest way to get my 3D ISO to work ?

Berst regards and thanks in advance
Joe