3D Frame Packed (MVC) output with CoreELEC?

For the last couple of years I’ve been using a Vero 4K for my 3D playback needs, and frankly it does most everything I need, but while I was doing some cleanup, I found a LibreElec I tried a couple of years back, so I updated it to the latest build.

It seems to be able to play most 3D movies without issues, including MVC MKV, but those have a problem: Subtitles and OSD. For some reason, the OSD and the subtitles are only shown on the left eye (technically that would be the top frame of the pack). If you look close you can even see that every other scan line is missing. This make the subtitles and the OSD almost impossible to watch without getting a headache.

In Side by Side or Top and Bottom , the OSD/subtitle splits in two and is shown to both eyes, but on MVC files, it doesn’t seem to do anything.

Can This be looked at, please?