64-bit register names don't get highlighted (x86, fasm)

<img width="1280" height="1024" alt="Image" src="https://github.com/user-attachments/assets/d16c0710-9e37-44d0-b942-65e5890619c3" />

more:
<img width="1280" height="1024" alt="Image" src="https://github.com/user-attachments/assets/72b8ceb1-fa54-43c8-ac3c-48532fd30426" />

Editor: neovim on linux
Assembly format: FASM
Architecture: x86-64