i can second this,
i also use a special plugin
WooCommerce Custom Fields for Variations by Iconic
to add custom fields to each variation
because acf wont allow custom fields for each variation, and
i also have to use version 11.0.1, in order to get these fields to appear, which is very frustrating, because i have paid for the elite version also,
so im currently stuck using 11.0.1 in pro version,
you guys need to find a way to get these to reappear.
in the list.
(co-incidently, for some reason, after swapping between pro 11.0.1 and the latest elite version a few times, 1 of my custom fields has stayed available to use in the elite version, but the others have not appeared,
needs looking into
