I tried now with the marked build. Dropouts are gone in both vst and au. There is some minimal dropouts when I change presets with vst but not au, but I think this is no problem, there are some differences between au and vst though.
Importantly, sliders are not automatable now, well most of them except some random ones (different for au and vst). For reference I tested also the previously exported plugins with results consistent to what I saw previously. In ref, to the last video you posted, could you try changing slider with the buttons (x2, /2)?
I’ll try it also in Reaper this evening, after I learn how to handle automation there.