On 2024-05-03 16:55, Lawrence Velázquez wrote:
The sysread builtin is provided by the zsh/system module. You have
to load the module and enable sysread before you can use it.

	zmodload -F zsh/system b:sysread

This has already been done in the shell that works, either by you
or some code you sourced.
Never did that knowingly, anyway that fixes it.  I'll keep an eye on when/what might be loading that module without my knowledge.