Bukkit

Configure a simple quartz pillar block cannon (3 quartz pillar blocks, 2 buttons, & 1 sign)
In game build a quartz cannon in the north/south orientation.

BUG: Cannon is not detected.

Cannons Version: 2.4.7
Spigot Version: 1.12.2
World Edit Version: 6.1.7

Building the cannon in the east/west orientation caused it to detect properly.

Here's a link to Google Drive with the files used

https://drive.google.com/drive/folders/13pEMAFUU_yjj11cU_m15edQx9Fo-iqhg?usp=sharing

The same occurs with Bone Blocks and Purpur Pillar Blocks

If the blocks themselves are facing east/west but the cannons is build north/south it still manages to detect but it can't handle the orientation of the blocks if they're starting north/south.

All blocks made out of logs work fine in all orientations. Quartz Pillar Blocks, Bone Blocks, and Purpur Pillar Blocks behave a similarly to log blocks and should be treated the same.

I hope this information helps.

This seems to be an issue of Worldedit. Rotating the schematic with Worldedit commands does not turn the quartz blocks. Also making a second design with different rotation did not help.

This is the WorldEdit issue that concerns the quartz pillar, purpur pillar and bone block.

https://dev.enginehub.org/youtrack/issue/WORLDEDIT-3587

The sad part is the vanilla Minecraft has states for the rotations of these blocks that WE hasn't implemented.

Fixed with Worldedit 7 and Cannons 2.5.0