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).