"Small Pistons" and "Small Piston hinge" disconnect from grid after Merging and reloading
The bug is simple and has been around since I played Beta.
1. You take two pistons and merge the new grids on the hinges together to form one grid.
2. Then you merge the first grid with the the last grid by using those pistons and retracting or pushing on to a merge block with a New merge block.
3. Sett the Piston's to ether reverse or push at full strength after merging and reload.
Ether the piston hinge has magically disconnected, not from the piston, but from the block the hinges where connected to, or the pistons have gone straight through the block the hinges where connected to as if the block isn't even there. Best of luck.