CUSTOM_FIELD1 being ignored by AMT template used with host entry

I have created a host entry and entered a "management IP" address in CUSTOM_FIELD1 under information. I've then created a template for an Intel AMT connection, and in the host field I have entered $CUSTOM_FIELD1$. However, when connecting using the host entry and selecting the Intel AMT KVM template, RDM still tries to connect to the IP address in the host field of the entry.

To test whether or not the CUSTOM_FIELD1 variable has the correct value, in the template I have added a custom VBScript to the "Before Connect" event that simply creates a message box with argument 0, which in this case I have configured CUSTOM_FIELD1. The message box appears and I see the correct IP address from CUSTOM_FIELD1, however the Intel AMT VNC connection still uses the IP address from the underlying host entry "Host" field.

Is this a bug or am I doing something wrong here?

RDM Free Edition: 2020.1.10.0