Really strange observation:
https://vimeo.com/306275921
When I save a presets of the CADMIUM synth with the REAPER presets management, I'm not able to reload this presets (or all other own presets) when I load e.g. HIVE or ZEBRA. Problem was reproducible and appears in a new project. I made a test with Zebralette too and there was no problem. I also got some Reaper crashes when playing around with this project. When CADMIUM runs as a dedicated process the problem is gone.
With Hive and an own preset of Zynfusion all is fine.
Likely a VST bug and not a bug in Reaper itself I guess. (??)