Spawn() creates a new Armourstand on the given Position.
If i go ingame, Spawn the hologram, leave and rejoin the Hologram
is on the correct position for 4 second, than it jumps to 0 0 0 of the Chunk
If what you are describing is a bug in Sponge, then it will not get fixed in an API 3 version. Whatever you’re talking about is almost definitely fixed in the newer versions. Exactly like the last time you posted.
The fix is to set the location again after spawning if I recall correctly.
I had this issue on API4? maybe early API5?
Unsure if it still persists to date.