Unable to reference heater_generic through display syntax

Klippy log at the bottom of this post

I’m trying to set up a display on my new build utilising configs that are happily working on other printers, and I have a problem that after discussion in the discord #macros channel I believe is a bug.

The problem is being able to reference a ‘heater_generic’ through display syntax. I get an error that a ‘,’ token was expected. If this uses any other form of heater or temperature sensor (as per my other builds) then it works without issue. It feels like ‘heater_generic’ is almost not recognised as something that can be referenced as part of [printer].
klippy (3).log (12.6 KB)

Does this work?
printer["heater_generic chamber"] instead of printer[heater_generic chamber]