It seems that item names have been adjusted to match the Java version in this version,
which has resulted in strange item names, such as Chain XX becoming Chainmail XX
Please fix it to normal as soon as possible
(I talk about the 1.21.30 update in this video URL: https://youtu.be/H-ojAnCFzOE?si=fM3z5biF3xvtUZR9)
This is intentional per the changelog:
If you would like to suggest that these changes be reverted, you can do so on the Minecraft Feedback Site or Minecraft Feedback Discord server.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support (Technical Issues) – 📧 Microsoft Support (Account Issues)
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki