User saving with an error

User saving saving happens with an error "The password confirmation does not match.".

Works fine if replace rules from `'sometimes|string|min:6|confirmed'` to `'nullable|sometimes|string|min:6'`.

I guess it is a [sofa/eloquence-validable](https://github.com/jarektkaczyk/eloquence-validable) bug.

Reproduce user saving with the validation rule `'sometimes|string|min:6|confirmed'` and compare it with the reported nullable variant. Start by tracing the user save validation and inspect the linked sofa/eloquence-validable package behavior. Done means the intended password confirmation validation works without causing the save error, with a regression check for both rule forms.

Written by the indexing model from the issue text.