I really can't tell where the problem is but OnStepX had changes to the sync commands ahead of 10.20a so who knows.
More detailed command logging... even enabling logging in OnStepX (on a different serial interface than this is talking across) might shed some light on it.
I see weaknesses in the Sync :CM# command return and added code to the master to "harden" it against that. Not sure there is a problem but it's not impossible.
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