Why do backgrounded commands in Zsh functions not show correctly in jobs?

In Bash 5.2, the output of jobs after either of the following is identical modulo job numbers:

sleep 3
# press C-z

s() { sleep 3; }
s
# press C-z

In both, jobs produces something like

+  Stopped                sleep 3

--- In Zsh 5.9 (x86_64-apple-darwin20.6.0), the first produces similar enough output containing the sleep command:

+ suspended  sleep 3

The second produces almost useless output:

+ suspended

--- I have [lots of functions that invoke Vim with different arguments or completions](https://github.com/benknoble/Dotfiles/blob/854f9498cb90af3b84cb961a9e97cf0009970f31/links/zsh/vim.zsh) ; suspending Vim during the execution of any of them via C-z or :suspend puts such a useless entry in jobs. It's not uncommon for me to have 2 or more such jobs, in which case it is rather difficult to keep them straight. Why does Zsh do this and is there a way for me to fix it?