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If you have a hold in the chord sheet A... no UserTrack will play where the hold is, this will have to change now to allow a UserTrack belonging to the parent UserTrack that are just a Hold for 4 bar duration, in the UserTracks Development F5 setting "Don't start a new riff on this bar" is checked for bar 2-4 of each Hold so it always plays from first bar of the Hold.
Riff Edit in the Tracks view will allow timing adjustment of the Hold, Shot or Push, a Shot can be made with a Hold and just shorten it, a push is just a Hold playing a 1/16 ^^ or 1/8 ^ before the beat, for a bit then back to normal playing.

All this will work well if UserTracks are made again to keep playing through the Holds, Shots or Pushes. At the moment you need to manually take the Hold out of the Chord Sheet A... > A