Describe the Suggestion

basically a Block made to be used as a "Place holder" in a schematic and replace itself to a Air block when placing a schematic blueprint via creative mode or via the canon
for like Tunnel schematics with the canon/schematic blueprint via creative mode

honestly create itself needs this or something like this for schematics usage if you want something to be a Air block no matter what if placing the schematic under ground so only those specific blocks become the air blocks and the "air blocks" in the schemetic dont remove the current block

also a problem with the canon since you only have limited options on this
either all air blocks in a schematic if placed underground dont remove current blocks
or
ALL air blocks in a schematic if placed underground removes current blocks

you cant choose specific what blocks to become "air" blocks or not in a schematic
but this kind of block can be a solution to it

i made this quick mod(in Mcreator however) as shown in this video
where if you sneak place it
it dont get removed in the world and if you place it it just remove itself as soon is in the world
and just using scaffolding in its recipe

but honestly better if it was inside create itself over a standalone mod since more modpacks has create than this small mod
since it is just 1 item basically sololy made for a create usecase for 1 thing in create mod

Screenshots and Videos

PlaceHolderBlock2.mp4

TunnelExample2.mp4

Additional Context

No response