https://github.com/portablejim/BetterBuildersWands/blob/1.12/src/main/java/portablejim/bbw/core/WandWorker.java#L228-L247

It definitely should be calling the place event to make it seem as if the player actually placed down the blocks.

As an addition to this, I am assuming that because it doesn't call a place event that you are able to place blocks that have the "cannot be placed" NBT data.

https://minecraft.curseforge.com/projects/level-up uses this data when giving a secondary ore drop as part of the player abilities. Because the Builder's Wands can place these blocks the players can dupe ores infinitely.

If you require any extra info from me, please let me know.