When in the F3 menu with an item in any slot under text in the menu, that item will appear over the menu.
REPRODUCING
Open the F3 menu while having an item in the any of the last inventory slots, while looking at grass (or any other block that has a sufficient amount of properties)
EXPECTED RESULT
The item appears UNDER the F3 screen.
Thank you for your report!
We're tracking this issue in MC-153643, so this ticket is being resolved and linked 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 to see if the issue has already been mentioned.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki