Error when reordering array items with relationship fields

[maicolsantos]

Hi,

I'm getting an error when using a field of type array that contains relationship fields inside.

After adding around 10 items and trying to reorder them, the admin UI throws the following error:

Uncaught TypeError: Cannot read properties of undefined (reading 'findIndex')

This seems to happen consistently when reordering items after a certain number have been added.

Tested with Payload CMS v3.

Thanks 🙏