(Sorry, sending this again -- forgot to hit reply all.)
I don't have any other versions of Emacs on this machine. I do have 28.2 on Windows (no WSL2) on my work machine, and I don't recall ever having this problem.
I ran 'emacs -Q -l /mnt/home/share/.emacs.d/init.el' followed by C-x C-f '/-:|sudo::'. I see the following. It didn't touch my init.el.
Scan error: "Scan error", "Unbalanced parentheses 1 2" [3 times]
Scan error: "Scan error", "Unbalanced parentheses 3 4"
Scan error: "Scan error", "Unbalanced parentheses 1 4" [2 times]
Scan error: "Scan error", "Unbalanced parentheses 1 2" [15 times]
Scan error: "Scan error", "Unbalanced parentheses 3 4"
Scan error: "Scan error", "Unbalanced parentheses 1 4" [2 times]
Scan error: "Scan error", "Unbalanced parentheses 1 2" [12 times]
Scan error: "Scan error", "Unbalanced parentheses 3 4"
Scan error: "Scan error", "Unbalanced parentheses 1 4" [2 times]
Scan error: "Scan error", "Unbalanced parentheses 1 2" [9 times]
Setting ‘tramp-default-proxies-alist’ temporarily since "emacs -q" would overwrite customizations [2 times]