Repeater BelongsToMany not working on edit form

             Forms\Components\Repeater::make('clientLocations')
                    ->relationship()
                    ->simple(
                        Forms\Components\Select::make('location_id')
                            ->relationship('location', 'name')
                            ->required()
                    )
                    ->columns(1),

    public function client(): BelongsTo
    {
        return $this->belongsTo(Client::class);
    }

    public function location(): BelongsTo
    {
        return $this->belongsTo(Location::class);
    }

update
  `client_location`
SET
  `location_id` = 3
WHERE
  `` = 39
  AND `` = 39