Quartz block can't be crafted back into quartz

Thank you for your report!
However, this issue is Working as Intended.

https://minecraft.gamepedia.com/Block_of_Quartz

Quartz blocks cannot be used to store nether quartz, due to the fact that they cannot be crafted back into it unlike other ore blocks.

Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki