In the current JAV system of vetted production companies and actress' rights, all or a portion of the money for an appearance reused in a compilation goes to the actress directly. This
started in 2018 with the founding of the industry group
AVAN. AVAN handles payment from publishers directly to performers without involving the management agencies.
Interestingly you can look on the AVAN website for
a PDF list of every actress who has yet to register to get direct payments. The list is mainly for actresses to check for themselves to make sure they are properly registered. As of 10 September 2022, there are 4914 current and former performers on the list who have not signed up with AVAN to get paid. (So if you search the list for your favorite actress' name and you
don't find it, that's a good thing!)