A contraption like so with a block placer, a block breaker from any mod and a redstone torch leads to blocks being duplicated. https://images-ext-2.discordapp.net/eyJ1cmwiOiJodHRwczovL3B1dS5zaC9wV2xEeS81NjkyNTU5OGE5LmpwZyJ9.vcNcB9uAYnEkEcqA3A1Jxg1wa3o

Same as #444 but for whatever mod that block breaker is from.