whitelist adds wrong UUID to whitelist.json

heya, i've been having this recurring issue on all of my servers where adding someone via the /whitelist command adds the right username, but the wrong UUID, to the server's whitelist.json file. they are all paper servers tied to a proxy. the only solution is to update the whitelist.json with the right uuid, and then restart the server, which takes time and is an unnecessary amount of work as startup takes a while.

how can i fix this issue so it adds the right UUID to whitelist.json?
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