Hello,

As in the video below, I place a slab and then I use the following command on the block:

/summon minecraft:falling_block -433 111 -168 {BlockState:{Name:"minecraft:andesite_slab",Properties:{type:top}},Time:-1000000,NoGravity:true}

at that time, the block turns into a ghost block that can no longer be broken. Then I delete the falling block and the block is invisible, you have to click on it so that it reappears to break it.

The video : https://youtu.be/7q64k9DMdX8