when using /clear and /give in the same tick, example, you have a /clear command block, and a /give command block, the inventory is confused, and ghost items are created. another item has to be moved into the slot that the item is in, so that the item will reveal itself.
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Comments 3
make sure that inventory is empty exept for dirt.
impulse command block: /clear @p dirt
chain command block: /give cobblestone
ghost cobblestone should now be in the first inventory slot.
attempt to place another object in the first inventory slot to reveal.
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-30190.
Your additional information and observations are very useful, so if you can add them to the comments section of the parent issue it would be appreciated.
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Could not reproduce this in Windows 10. Please provide the sequence of commands that your command blocks are executing and say which slots are left with ghost items. The hotbar slots are numbered 0 to 9 and the remaining slots are 10-27, from top left to bottom right.