This is know issue affecting ESXi 6.5.
To work around this issue if you do not want to upgrade, add this option to the /etc/vmware/hostd/config.xml to disable the logic that triggers the false positive.
<config>
<plugins>
<vmsvc>
<enforceVmxSandbox> false </enforceVmxSandbox>
</vmsvc>
</plugins>
</config>
Note: The hostd process will need to be restarted for the option to take effect.