With with an exported VST2 plugin from Blue Cat Audio's Plug'n script it shows the editor as blank, like this.
The VST3 version shows correctly and that same VST2 version shows correctly in FLStudio and MuLab except in Waveform. This happens in the latest stable waveform as well as the current beta.
Here is a link to my VST2 https://drive.google.com/file/d/1TEvKxu ... sp=sharing