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Thank you for your insights. We had this issue reported already and there was a discussion about additional values in the config. Our RnD department currently planning to release a JSON-RPC backend overhaul with the 7.2 release and at this moment deleting superuser value is correct approach if you do want to continue JSON RPC.
Regarding the issue, you are having may I know what type of OpenVPN connection you established? Is it a tunnel or tap-bridge? Could you try doing it in the latest firmware of RUT240 RUT2XX_R_00.01.14.3_WEBUI.bin. In upgrading the firmware kindly do it without keeping the settings to prevent configuration conflicts.
If the issue still persists after doing so kindly share with me a copy of the troubleshoot file.