Nevermind, but thanks for the reply!
I'm a complete idiot (as i guessed before
)
VST3 bridging obviously isn't very common. One has to check the plug in a same architecture host. I just recognized it when i discovered a post in the reaper forum from Justin, where he states exactly that. I must have forget because my last VST3 testing was several months ago.
After doing it the right way everything works as expected...