GJS component fails with "undefined helper" error when shown via modal service (Discourse 3.5.0

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I tried your minimal test code and it works for me:

This image shows a modal dialog box with a title "My Modal Title" and placeholder text "MINIMAL MODAL TEST," along with two buttons labeled "Cancel" and "Submit." (Captioned by AI)
This image shows a modal dialog box with a title "My Modal Title" and placeholder text "MINIMAL MODAL TEST," along with two buttons labeled "Cancel" and "Submit." (Captioned by AI)603×220 6.94 KB

The only changes I made is to add a missing action import, removing a comment outside the template and forcing the button to show.

Can you make a quick TC on GitHub that triggers this error?