These blocks are of the same type as cobblestone. For example, they can both be used in the game to unlock the Stone Age, so they should also be able to craft pistons.
Linked issues
duplicates 1
Attachments
Comments 2
Hi!
Thank you for your report!
We've already resolved this issue at MC-177904 , so I will close and link this ticket as a Duplicate.
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki
Thank you for helping us improve Minecraft! We saved your files: