Making a derived major mode based on exwm-mode makes windows disappear

[lrustand]

I'm trying to make a derived major mode from exmw-mode for a specific type of exwm buffer. It seems that activating a derived mode breaks some exwm functionality, making the window disappear.

Minimal reproducing example:

(define-derived-mode my-exwm-mode exwm-mode "My-EXWM")

When activating this mode in an exwm buffer the buffer disappears.

[lrustand]

Okay, I see what is happening here. This is hardcoded behaviour in exwm-mode, as seen in the following line in the mode definition:

  ;; Change major-mode is not allowed
  (add-hook 'change-major-mode-hook #'kill-buffer nil t)

Would it be reasonable to add a check here to see if the major mode is a derived mode of exwm-mode or not, and to allow changing to a derived mode?