Certain blocks' top-texture is rendered with grayscale when in your hand and in first person.
As far as I have seen, these blocks include:
Grass Block
Every leaf block
Related issues
Attachments
Comments
migrated
[media][media]
violine1101
Thank you for your report!
We're actually already tracking this issue in MC-161841, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki