Normally Alt+h launches run-help.
For example type a command being a program name, a shell builtin, an alias and press alt+h, it will run run-help, which will open the man page, or the zsh man page at the good section.
But if i type a reserved word like if, for, do, while, time and press Alt+h, nothing happens.
Launching 'run-help while' will work, it's just the shortcut Alt+h -> run-help not working.
Someone can confirm?