I upgraded my MC world from 1.17 to 1.18.1. And when I was moving my shulker boxes they disappeared after being mined. I found that it only happened to those shulker boxes that weren't coloured. I tried reloading Minecraft but nothing helped. The items that were in the shulker don't drop either. This matter has to be resolved because it cause a lot of damage.

I have attached a video to show you what I mean.