When unloading and reloading chunks with cushions there is a chance for them to despawn. I’ve had this happen after to me after spending hours working on a house with the brand new cushions to log on later to find some of them gone
Steps to reproduce:
Place down a bunch of cushions (easier to see on a large scale)
Exit the game or the chunks (/tp ~1000 ~ ~)
Rejoin the game or re-enter the chunks (/tp ~-1000 ~ ~)
Observe the cushions to see if any have disappeared
Additional information:
The video attached shows exactly as i described and you can see more and more of the cushions disappear the more i reload the chunks
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