When generating two or more schematics at the same time I ran into an issue where many of the blocks weren't being placed, in the attached image the 2 pixel art schematics at the back are from a custom reward, and the front 2 Schematics are the built-in Village reward.

I would suspect the schematic placer was not meant to handle 2 at a time and gets de-synced with the iterator(s) going through the schematic(s) selecting the block to place, causing the placer to lag behind and/or flip between the 2 or more iterators as they update.

Separate Issue in the same image: The Giant Chance cubes also don't properly react to the reward selector pendant, and only one of the multi-block's components is removed. However the selector pendant is almost entirely used for reward testing so it's not that big of an issue.

Version is 1.11-2.3.3.136

Meanwhile in 1.10.2

Village looks much better, Kappa is still half the man he should be

I would recommend doing all of this in 1.10.2 as the mod is much more stable there