I have asked 100 times to fix this !
I notice it when using 2 Plugins, say if you set the first to 4 bars with no ending then set the second one to start sync on bar 5 with no count-in.
When you do this you get a jerk on the last beat of bar 4 as it goes into bar 1 of the second Plugin.
You don't get a seamless join unless you add an extra bar and turn it off with volume automation or delete it off when dragging in.