Uuid's not consistent with proxy

hi, I have the issue where my paper servers behind waterfall proxy are creating their own uuid’s.
I’ve spent some time on google and found the IP-forward option in the waterfall config, but still my paper servers won’t use the actual uuid’s

does anyone have an idea?

waterfall 1.17 (451) latest
paper 1.17.1 (353) latest
both are running on the same machine.

set bungee in spigot.yml to true, that will change the UUIDs of everybody connecting back to their v4 UUIDs, but, will lose existing player data, etc