[MC-237833] In 1.18, I copied a shulker box containing a command block copied from an earlier version (1.17.1), the contents are all gone, but it works.

These command blocks allow you to share achievements using "execute".

Environment

window 10, NVIDIA GeForce GTX 1060 3GB, JDK 16,

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We're tracking this issue in MC-236663, so this ticket is being resolved and linked as a duplicate.

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