As the title describes it, silk touch does not seem to work for the last durability of a tool. It will give a normal diamond instead of a diamond ore and cobble instead of stone etc.
Environment
in singleplayer as well as in a server i am playing on.
Thank you for your report!
However, this issue is a Duplicate of MC-136865.
If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki