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Here is the offending line:

In bash, running jobs in a subshell will print nothing, even if running jobs not in a subshell will print something. This is different from zsh, which will print the same thing regardless of whether jobs is run in a subshell or not. So this logic is broken in bash currently.

If you remove the parentheses (i.e. run jobs in the current shell), then bash displays the correct number of lines (iirc) but zsh will display one more than the correct count when you are in a different directory than when you spawned the suspended process (otherwise it displays the correct count). According to https://unix.stackexchange.com/questions/251868/jobs-wc-getting-weird-return-values this is due to zsh displaying working directory information. Weirdly enough, zsh only displays the extra information when being piped. (Try it: jobs vs. jobs | cat.)