Cannot set parameters for a "button"

In Designer, UI > Buttons

• Create a new "Button" (so, using nuxeo-operation-button).
• Fill infos
• Set up parameters. For example, {{ {"newState": "Approved"}

  }}

• Save

=> params are cleaned up.

(see NoParamsSaved-720.mp4)

Workaround: Directly write pin the -bundle.html, but this is certainly not recommended (risk of screwing up the bundle)