Why does this VST plugin turn its track mono?

I use the Matt Tytel Helm open source synth plugin and I find that I cannot get a stereo output from any Instrument track it is used in. Stereo FX such as delays or reverb become mono. I’ve not see this happen with any other plugin. How might I fix this?

Maybe you should ask Matt how it’s implemented. Maybe he has it intended.

I heard of HELM before, but never tried it. So I tried it.
My Cubase 13.0.2 installation blocks it and refuses to reactivate it.
I tried the standalone:
Does the metering on top show a stereo output? I found that only the reverb creates a stereo output. When you turn off the reverb at any stock presets it turns mono.

It’s the same on my system.