When I played on my favourite server running the modpack Stacia expert v1.11.14, I tried using the shrinking device on several creatures and then on myself. The first subject I have shrunk was a llama, which resulted in the llama disappearing and suffocating in a nearby wall. The second subject was a wandering trader, which after being shrunk also disappeared, took two hits of suffocating damage and then went silent, not even showing on the mob radar, presumably dying somewhere far down. Then I used the shrinking device on myself, this was a fatal mistake however, because I immediately started taking suffocating damage, I was also sometimes falling trough the floor and immediately retuning to my original position, my movement was incedibly buggy and jumping was too. Also trying to enlarge myself again trough shift+right clicking was proven futile, retuning a message to chat: "Unable to open while shrunk." (Or something like this, I may not be remembering it correctly). When my inevitable death from suffocation has come, I respawned and found out that standing on my bed prevents me fom suffocation. After that I returned to my deathpoint using /back, Broke me grave and finally enlarged myself by pressing "g" repeatedly.