List State: `collection.getItem()` can return `undefined`

Provide a general summary of the issue here

Well. I have a very hard to reproduce bug - it's randomly happening - and hard to check in the current repo the returned type. So, I build a Combobox thanks to the hooks and load async some data to fill the items - with or without useAsyncList btw - and sometimes I receive:

Uncaught TypeError: Cannot read properties of undefined (reading 'index')
    at useListState.ts:81:21

so looks like that here https://github.com/adobe/react-spectrum/blob/b5974ad1ccf2abc984c5cc6664b3c2d03de36768/packages/%40react-stately/list/src/useListState.ts#L63 collection.getItem() can return undefined

🤔 Expected Behavior?

It doesn't crash ^_^

😯 Current Behavior

It does crash :-/

💁 Possible Solution

No response

🔦 Context

No response

🖥️ Steps to Reproduce

It's a very hard issue to reproduce and hard to have an easy example unfortunately. I can't have a setup with the current reop that returns another type that "any", so it's really hard to find out what happens.

The only thing I know it that you need to:

• open the combobox
• put some text (not necessarily needed)
• select an item
• it reloads the items list because filterText changed (set by the selection)
• clean the selected Item
• it reloads the first 50 items (filterText = "")
• repeat

as fast as you can to trigger it. I feel like checking the possible returned value of getItem would be easier but I was unsuccessful here.

Version

latest

What browsers are you seeing the problem on?

Chrome

If other, please specify.

No response

What operating system are you using?

Windows

🧢 Your Company/Team

No response

🕷 Tracking Issue

No response