Playing in a multiplayer world with a friend we realize that whenever we open a shulker box, the guest game in the world crashes.
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Before answering I decided to do some tests to be more accurate. I noticed that the game doesn't always crash, but it happens very often. As far as I’ve ever noticed that at least one of the players in the world has crashed opened a shulker box on top of it. I also noticed that when my friend opened the shulker box on top of it, my game would stop and when I opened the shulker box on top of it, my friend's game would stop. The second situation is much more frequent than the first.

Thanks for the additional information. We're already tracking this issue at MCPE-60856, so I will resolve and link this ticket as a duplicate.
Were you standing on the shulker box when opening it?