OMG, after all these years, finally discovered super secret move.
In order to open the menu in "Original mode" to check how many coins are unlocked, You have to press UP and Enter together, extremely precisely and Let go same time, really fast.
If you hold up and press enter, which is what the UI indicates you should do, it will just kick you out of the menu.
If you hold either key slightly longer, it will kick you out of the menu.
Crazy bug.