Minecraft 1.17.1
Litematica printer 1.17 1.8
delay set to 0.2 range to 6(changed later to 4)
I have a strange bug when I place layers, verify them, everything seems ok. Then relog/move away and when I come back there are blocks missing in every layer. And I need to reverify it and fix.

before and after logout. those screenshot are apart by seconds.

Looks like lowering the range to 2 blocks fixed that... Damn I've already redone it and reverified 7 times...what a pain...Currently have delay 0,3. Looks like it was the range not the speed that was causing this. After further testing works fine even with 0,1 delay. But range must be set to 2. Anything higher results in ghost blocks.

had same issue thanks for telling how to fix tho

Latest update also tried to address this. Hopefully this won't be much of an issue going forward.