CONFIRMED – behavior still exists in Minecraft Version 1.19.2
Minor new developments.
On creation of "Ghost items" replicated in Step 1.1, If you attempt to move it to the hotbar using a number key (e.g. move a "Ghost Item" to the number 1 hotbar by hovering over the item and pressing [1]), it will be deleted like normal. But if you do it a second time, the item won't delete like normal. This is replicable for each hotbar slot.
It should also be noted that, when creating the "Ghost Items", and attempting to /clear or delete all using [Shift]+[Clicking] "Destroy Item" in the creative inventory clears all loaded preset hotbar items and the very right-most item in the Inventory (as these are not "Ghost items").
Example: Hotbar is full from loading hotbar (Player container.[0-8]) with mysterious items appearing in container.9 container.10 and container.11 (achieved by replicating the Ghost Block steps 3 times) – Hotbar (container.0 to container.8) as well as container.11 will always contain real items, whereas container.9 and container.10 will contain "Ghost Items")
CONFIRMED for 1.19.3 and snapshot 23w03a.
I still believe this issue would be resolved if MC-197793 was addressed instead. I'm not sure why this was marked as resolved, as this can still be replicated and is the main catalyst for this issue (i.e. if MC-197793 was addressed, then this would – by default – be addressed as well.).