HR Workspace: Email Client Template “To” field not populating from custom string field

[cronnewall]

Hi,

I have an Email Client Template on sn_hr_core_case.
In the To field i use: 

javascript:current.u_external_email ? current.u_external_email : current.opened_for.email

u_external_email is a string field containing a valid email address.

The behavior I'm seeing is:

• In Classic UI:

  • If u_external_email is filled -> To is populated correctly.

  • If empty → falls back to opened_for.email.

• In HR Workspace:

  • If u_external_email is filled -> To field is empty.

  • If empty → fallback to opened_for.email works.

So Workspace seems to ignore the custom string field but accepts opened_for.email.

Is this a limitation in Workspace email client?
Can Workspace only resolve certain reference fields for recipients?
What is the supported way to populate the To field from a custom email field?

Thanks!