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Repeater and auto-increment field

I have a form with a repeater and I have a field for the number of the element. I want that field to be prefilled and created whenever clicking the 'Add' button. I got the maximum number from DB and prefilled the field(the label), but it won't apply to the next element until I save the last one. 
return Repeater::make('engine_llps')->label('Engine LLPs')
            ->relationship()
            ->columns(13)
            ->itemLabel(fn(array $state): ?string => 'LLP Number ' . $state['llp_number'] ?? null)
            ->schema([
                Forms\Components\TextInput::make('llp_number')
                    ->label('LLP Number')->hidden()->default(fn(Get $get) => CRMEngineLLPInformation::where('crm_engine_id', $get('../../engine_id'))->max('llp_number') + 1),
            ])
return Repeater::make('engine_llps')->label('Engine LLPs')
            ->relationship()
            ->columns(13)
            ->itemLabel(fn(array $state): ?string => 'LLP Number ' . $state['llp_number'] ?? null)
            ->schema([
                Forms\Components\TextInput::make('llp_number')
                    ->label('LLP Number')->hidden()->default(fn(Get $get) => CRMEngineLLPInformation::where('crm_engine_id', $get('../../engine_id'))->max('llp_number') + 1),
            ])
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