BUG: Effect Rack in the waveform editor applies undesired fade-ins with some 3rd party plugins.

Some 3rd party fx plugins result in an undesired fade-in after Applying via the Effects Rack in the Waveform Editor.

I demonstrated the problem in an attached screenshot and audio file, in which I generated white noise and applied the effect. This issue is repeatable even when the mix within the plugin is set to zero. The fade length ranges from 100-1000ms depending on the plugin. 

I've experienced this with Valhalla VintageVerb/Delay/Ubermod (supermassive works fine), Arturia Spring, and SoundToys FilterFreak among other plugins. Most plugins work fine (no issues with FabFilter, Goodhertz, others). I experimented, applying the exact same processing to the same files using RX10, Logic and Ableton and this does not occur. I've experienced this bug for years now and have reported it many times. I've also reported this to Valhalla and Arturia.

Please fix this!