Before boarding up the broken window, I did start hauling the four planks. As I cleaned up, I did notice the glass shards weren’t near me. Later, I found them teleported at the exact place where I started hauling the planks.
So, to replicate the issue:
- Have a broken window
- Pile 4 planks in one place far from the window
- Grab the nails
- Start hauling the planks up to one tile from the broken window
- Open the Construction menu
- Select Clean Broken Window
- Notice the glass shards now are at position from point 4.
Version is vanilla 0.E-3 without mods nor launchers.