I called support and learned this is expected behavior. This is not how other call recording systems work. The call should stop recording for the hold and start back once resumed.
A parked call can be picked up by any other agents and it is kind a new call (even the session id remains the same). I am not sure that it should behave as you expect that the recording must be resumed. It is not the same as hold/resume a call.
Using the RingCentral Phone for Desktop, you can dial or receive test calls, send and receive test SMS or Fax messages in your sandbox environment.
Download RingCentral Phone for Desktop:
Tip: switch to the "sandbox mode" before logging in the app:
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