Unexpected Colon Error

Wappler 2.9.1

Steps to recreate

1. Create a variable like this:

<dmx-value id="description_booking_names" dmx-bind:value="{{attendees.data.values(`first_name + \' \' + last_name`)}}"></dmx-value>

(which I know works okay as it returns a value)

2. Go to edit the variable’s value in the properties editor. Click on the [lightning] icon. In the Data Bindings window, click on the [Magic Wand] icon.

3. You get the following error message: