I started a creative game and I could still see all the devices when the game was started, and I tried to make a Quantum Portal Spawner but it just disappeared. And also the sentry name is visible underneath the sentry as if it’s a player
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Lag? that’s my best guess
The sentry thing is an update. Is it just me or did sentry's get display names? - #8 by VWOOM
For the devices it may be lag if there’s not a lot of memory left in your map.
Yeah, the sentries have names now, apparently, as part of the new update:
New Update: February 5th, 2024 
Lag has never done this before though, and my internet is pretty good
There is plenty of memory left, and some other people I know have also encountered similar problems recently