Corner stairs with torch/lever/button etc. doesn't cause block update when near destroyed support stair

The bug

Corner stairs with torch/lever/button etc. doesn't cause block update when near destroyed support stair

To reproduce

1. Place corner stairs (as in the screenshot)
2. At the corner steps, place the block that needs the support (lever, torch, etc.)
3. Break the non-cornered stairs
   The lever / torch / button does not drop out when those stairs were broken.