OK so I decided to run a little test for you. I first went into my offline game and sure enough I have the cursed tree in both my ancestral knowledge and I can spawn it just find via the admin panel.
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However I cannot find your server listed. I was going to try to create a character on there to see if I could still see the Cursed Tree in my Ancestral Knowledge when I logged onto your server but…I can’t find it. Can you DM me an IP address?

Edit: Actually, you didn’t specify this either. You are on PC right?