Accessor overrides custom validation rule - laravel

Question

I have created a custom rule to make sure the number is of two decimal places. The database has numbers stored as decimal(19,4). To display the number with only two decimal places, I also have put an accessor in place. Now the problem is that the accessor overrides the custom validation rule.
the relevant part from custom validation rule
public function passes($attribute, $value)
{
$precision = Config::get('accounting.decimal');
return preg_match('/^\d+(\.\d{1,'.$precision.'})?$/',$value);
}
the accessor in model
public function getRateAttribute($value)
{
$precision = Config::get('accounting.decimal');
return round($value, $precision);
}
the validation rule in the livewire component
public function rules()
{
return [
'editing.rate' => ['required', new NumberFormat()],
];
}
Desired behavior:
Whenever a user enters a number with more than two decimal places, it should throw the customer validation error.
Every time the field is used anywhere else to display, it should show the number with two decimal places. For eg: 78.9800 should be displayed as 78.98.
any ideas why this is not happening?
Edit:
Did a little more testing and this seems to be a laravel livewire issue. I am binding data directly to the model property. Because of that, when I edit the field, the accessor is immediately called before validation occurs.
Workaround:
I canceled the data binding to the model property. This solved the issue.
Still is there a better way to use laravel-livewire data binding to model property and use an accssor that would not override the validation rule.