It’s working fine for me. If you post some logs (preferably debug logs), the OSMC guys can check that your settings are okay.
A couple of obvious things to check:
Under Settings/System/Display/Stereoscopic 3D, make sure Preferred Mode is set to Same As Movie. Under Settings/Player/Videos/Playback, make sure Adjust Display Refresh Rate is set to On Start/Stop. Under Settings/Player/Videos/Stereoscopic 3D, make sure Playback Mode of Stereoscopic 3D Videos is set to Preferred Mode. Make sure the Kodi UI is running at 1080p resolution. And if you are using a whitelist, make sure all the “3D FP” modes are enabled. (Ignore that last one if you don’t use the whitelist).