Hi, I might be able to help you because I use Line 6 also. I tried to automate some effects on my tracks to see what you are talking about and I got the same thing you did. I can see the automated part in the track but don't see or I should say see and hear it kicking in. I never noticed this before because I really have never tried to do this before. It may be that it can't be done. I usually just set up Line 6 as best I can for whatever I am doing and then I'm stuck with it pretty much. There may be others here who know better and that's great, but if not, then I will continue as best I can to work this out with you because I wouldn't mind knowing this myself.
Not much help I know, but you don't find that many Line 6 people on here, at least I don't.
bob