Solved the problem by uploading the project that disabled CM33 core. Then, upload the XiaoZhi project to use CM55 core. This is from the conflict of two cores sharing the same UART.
This looks like a terminal/paste encoding issue rather than an RT-Thread problem.
Try:
Set XShell to UTF-8 encoding
Disable “smart/fast paste” options
Test with another terminal (PuTTY / Tera Term)
Paste into a plain text editor first to remove hidden characters
Since help works but pasted commands break, it’s very likely extra hidden characters are being added during paste.
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