Hi @James_Forrest, this is actually after fixing a “bug” that quite a few users reported to us. Apparently more people consider skipping numbers a bug.
An example: Toggle numbered list excluding/including checked items
Most of them complained about this issue via private feedback/email though.
I guess for counting purposes, you want numbering to update when checking items, so you know how many items are left. But if each number corresponds to something specific (like a chapter in a book), you want the numbering the stay. Is that your use case?