The top texture of grass blocks turns gray while it's being pushed by a piston. Not much of an effect on gameplay.
Steps to Reproduce:
Create a new world
Place a piston
Place a grass block in front of the piston's face
Activate the piston
Observed Results:
The top texture of the grass block turns gray while being pushed.
Expected Results:
The top texture of the grass block should not turn gray.
Video:
[media]Related issues
is duplicated by
Attachments
Comments

Resolving temporarily as Awaiting Response. Does this issue also occur without texture packs? If not, could you please attach the resource pack you're using to this ticket?

This issue does occur without any resource packs. After further testing, I found that this issue only occurs when the Caves and Cliffs toggle is enabled. I have updated the repro steps.

affects 1.17.30.20

affects 1.18.1

Confirmed in 1.21.44
Thank you for your report!
However, this issue has been closed as Cannot Reproduce.
We were unable to reproduce the issue. If you would like to add more information please do so, or file a new ticket if needed.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support (Technical Issues) – 📧 Microsoft Support (Account Issues)
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki