You would expect a creative mode punch to destory any block without dropping anything, but futurepack devices (like generator, researcher and so on) drop the block when broken on creative.

Minecraft Version: 1.18
Forge Version: 40.0.36
Futurepack Version: 33.0.7227

Do they always do this or only when they drop with NBT ?

Always, as far as I can tell.

I have noticed this behavior about FP items as far back as I can remember. I never considered that this was contrary to the behavior of non-FP items. I did not try this on every version but back when I was investigating use of multiple ion and calc modules.
In my opinion, anything complicated like FP machines (not all FP blocks) should drop the item, but I could be alone in that wish.

I don't know how to reply so I'm editing this. qrss is right.

Well, you can always copy blocks with all of their NBT data using Control + Middle click, but I guess that doesn't protect against accidentally destroying stuff.

the problem is at the point when I make the block drop I dotn have any information about why it dropped thus I dont know if a player ven cazsed this (and also cant check if ti should drop) - but sicne its sicne that like 1.12 and bwfor I would say I will keep it like that.