Subfield types set to unknown

[Oudwins]

Describe the bug

This is a typescript typing bug that was not present in 0.42.0 (I'm unaware of when it was introduced as I just upgraded to v1 from that version).

It causes some subfields's type to be "unknown". To encounter it you must have a structure that causes the field name to be something like this: prop1.array[${idx].prop

This does only seem to happen when the array and/or parent object in the zod schema is set to optional. But there are some reports of user's having a similar issue even when the parent array or object are not optional (https://discord.com/channels/719702312431386674/1100436934205124660/threads/1349742197788119052)

edit: some other users are saying that the issue happens when using null or optional on arrays

Your minimal, reproducible example

https://stackblitz.com/edit/tanstack-form-uqugutkr?file=package.json,src%2Ffeatures%2Fpeople%2Fshared-form.tsx,src%2Ffeatures%2Fpeople%2Fpage.tsx&preset=node

Steps to reproduce

1. go to page.tsx in the example
2. Find the form.Field with name invoice.items[${0}].isPhysical
3. See the error

Expected behavior

I expect the type in the field.state.value to be correct

How often does this bug happen?

Every time

Screenshots or Videos

No response

Platform

• Chrome
• Linux

TanStack Form adapter

None

TanStack Form version

v1.1.0

TypeScript version

unsure

Additional context

No response