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I tested out just calling Serial.end() and it looks like it's fixed the kind of issues that I was seeing before. This was without even running Serial.begin();

Did you ever work this out? I'm seeing the same behaviour.

I saw in the release notes for 2.1.6 they said:
"Allow disable USB using Serial.end(). Before that non-connected USB was leading to Z-Uno Module hangs."

This was really helpful, but took me a little bit to work out what you meant. For anyone else that might come across this, to fix this issue: Edit the platforms.txt file for Z-uno here: "~/Library/Arduino15/packages/Z-Uno/hardware/zw8051/2.1.7/platforms.txt" Copy the variable set in recipe...