Not able to use treesitter derived mode with straight

[xofyarg]

Given the following config, straight will byte compile the package, and generate an autoload file. The autoload file pulls in rust-prog-mode unconditionally. I'm not sure how to workaround this, maybe wrap the file content with a runtime check?

(setq straight-use-package-by-default t)
(use-package rust-mode
  :init
  (setq rust-mode-treesitter-derive t))

$ cat rust-mode-autoloads.el
...
;;; Generated autoloads from rust-prog-mode.el

(register-definition-prefixes "rust-prog-mode" '("rust-"))
...

[psibi]

I'm not sure how straight works to comment on this. But I would be happy to accept a documentation PR if you have found a workaround for this ?