Invaders are almost as bad as Sortie Tact when it comes to moderators. I have one too. My first .25.
The art with the Hatsans is getting the right return spring. By adding a moderator you increase the back pressure on the piston that drives the whole semiauto mechanism. I've never analyzed the mechanics involved but my guess is the mechanism is too fast and the magazine cannot index.
With the Barrage and Bullmaster you can add a regulator and between regulator pressure, return spring and hammer spring you can fine tune them to be quite reliable. Not a process that is quick...
The Invader has a tube so no regulator. So I tried polishing all the internal surfaces. This turned out to be a bad idea. My Invader is a bolt action regardless of moderator, return spring or hammer spring.
I get it out every few months and fiddle with it. Reconnect the mechanism and try whatever I have thought up recently but it has never worked more than randomly as a semiauto.
Mostly I am pretty sure it is the magazines are just too slow to index with increased speed of the mechanism.