zsh compdef command not found errors

[ukanga]

In a ZSH terminal with prezto enabled, starting a new subshell shows the command not found: compdef error message.

>>> wt new zsh-init-issue                                                                                                                                       
Entering worktree: zsh-init-issue
/proc/self/fd/13:2: command not found: compdef
/proc/self/fd/13:2: command not found: compdef
/proc/self/fd/13:18: command not found: compdef
/proc/self/fd/13:2: command not found: compdef
/proc/self/fd/13:213: command not found: compdef
(wt) home%