bug#46545: frequent test failure: cyclic-function-indirection customize-changed

[Glenn Morris]

Package: emacs
Version: 28.0.50

On hydra.nixos, check-for-wrong-custom-types often (but not always)
fails with:

  (cyclic-function-indirection customize-changed-options)

The first instance seems to be https://hydra.nixos.org/build/136593430
which presumably corresponds to 5beddcd325e8ec16a6f284ef0524fb796fe07d5e.

I have no idea why it is intermittent, and seems to affect random
variables each time.