No its not glitched, there is just an issue with searching it up, you can still sell it and buy it manually by going in the specific category, it just doesn’t show up when you search it for some reason. And if my memory serves me correct, Altars still drop seeds.
My guess is that the demon altar used to drop seeds but recently (between 2020-2021) they made it not drop any seeds anymore. Keeping that in mind it’s not a very valuable seed, but people may still pay a lot for it.
I don’t have it saved xd. I feel you and I am sorry to disappoint you but I really don’t have the footage of it so you can just discard that fact and go ahead break the Demon Alters by yourself and try to get that Seed which is expensive now.
I do record everything but I don’t save everything which I think is not worth saving.
Also I use AMD Radeon recorder to record everything (it uses system memory and when you save the recording, it saves the recording to disk).
Go ahead break 100 of them by yourself just like me to be disappointed that it didn’t drop any seeds. It truly doesn’t drop any seeds anymore (or Jake changed it because a lot of people were crying on the live stream about it not dropping any seeds anymore).