1.10 double vertical piston pusher don't work the same in the 1.11. It seems to have some relations with the redstone dust/wire direction and the "source" of power (levers for example). Some of the bottom piston won't extend.
MC-111057
Piston behaving in a weird way..
Resolved
Works As Intended
0
Thank you for your report!
However, this issue has been closed as Working as Intended.
The report you have submitted is working as intended, mechanics of the game may change between updates.
Things such as graphics, sounds, world creation, biomes, redstone, villagers, and animals may not work the same in current versions.
Full Version History – Snapshot Version History – Feature Requests and Suggestions
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki