When you press F3+any key that isn't programmed to do something when pressed in conjunction, the key still has the originial behavior instead of doing nothing.
Examples: F3+E still opens the inventory or F3+S still moves the player backwards.
Comments 2
Thank you for your report!
However, this issue is Invalid.
You have posted a feature request or a suggestion. This site is for bug reports only.
For suggestions, please visit Minecraft Suggestions on Reddit or visit the Feedback website.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki
This doesn't seem like a bug?