I'm trying to use people.set_once but it doesn't seem to be working.

I have a new user and if I tried to set some data using the people.set_once method, but it never gets set. I've double checked, the user doesn't have that data set. I even deleted all the data on an existing user and tried again, but no luck.

If I use the people.set method the data is set, but then it gets overwritten with each subsequent call, which is why I want to use people.set_once instead.

I'm using posthog-js v1.4.5.