Does THUMB_LOCATION actually work?

I was trying to get thumbs to be stored in a separate folder so I followed this: https://immich.app/docs/guides/custom-locations/

And yet the data is still stored in UPLOAD_LOCATION/thumbs

I am certain the container has the right env vars, and that the custom location for thumbs exists, and it's writable, etc.

So before posting I tried to find where in the source code THUMB_LOCATION was used, and found no references to it, except for the one markdown used to generate the doc above: https://github.com/search?q=repo%3Aimmich-app%2Fimmich+THUMB_LOCATION&type=code

So I am thinking.... maybe this env var existed at some point but not anymore?
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