When I`m standing in front of my small chest and open it, it fades out the second I opened it, so I can`t get access to my stuff. Works after restart of the world.

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I had the same problem with different storage-units.
Semi-solution:
1. Pick up your chest (or other storage-units)
2. Place your chest (you can place it in the same spot)
3. Chest-inventory shouldn't be fading out anymore
Good luck :)