I gave up trying to make it work under 10.15 and use 10.14 for packaging.
The 10.20's seem to stop at various spots during the after snapshots
(ran it 3 times; different stops; had to force quit once - the other two said the helper application had stopped communicating)
10.11 Composer does it with no problems carrying on doing the after snapshot.
Question
Composer helper stops communicating
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