Ok, I answer myself for users who have this issue too.
It’s a bug in TC-Helicon Voice Live Rack, that I submitted to TC-Helicon years ago with a video (Bug in Tc-Helicon VoiceLive Rack (firmware 1.0.09 build 26) - YouTube) and still waiting for a solution after all the “yes, we’ll fix it” (maybe in another life, but they didn’t specified)