Bug? Custom summarize with groups

 return $table
  ->groups([
      Group::make('user.name'),
      Group::make('start')->label('Start date (UTC)')->date(),
  ])
  // [...]
->columns([
  Tables\Columns\TextColumn::make('start')
    ->date()
    ->label('Start date (UTC)')
    ->icon('heroicon-o-calendar')
    ->sortable(query: function (Builder $query, string $direction) {
        $query->orderBy('start', $direction);
    }),
  Tables\Columns\TextColumn::make('start_time')
    ->label('Start time (UTC)')
    ->getStateUsing(fn (Model $record) => $record->start)
    ->icon('heroicon-o-arrow-left-on-rectangle')
  
    ->time()
    ->sortable(query: function (Builder $query, string $direction) {
        $query->orderByRaw('TIME(start) '.$direction);
    }),
  Tables\Columns\TextColumn::make('end')
    ->label('End time (UTC)')
    ->icon('heroicon-o-arrow-right-on-rectangle')
    ->time()
    ->sortable(query: function (Builder $query, string $direction) {
        $query->orderByRaw('TIME(end) '.$direction);
    }),
  Tables\Columns\TextColumn::make('duration')
      ->state(fn (Model $record) => CarbonInterval::seconds($record->duration)->cascade()->format('%H:%I:%S'))
      ->sortable()
      ->icon('heroicon-o-clock')
      ->summarize(
          Tables\Columns\Summarizers\Summarizer::make()->using(function ($query): string {
              return DateService::fromSecondsToHours($query->sum('duration'));
          })
      ),
  )];

 return $table
  ->groups([
      Group::make('user.name'),
      Group::make('start')->label('Start date (UTC)')->date(),
  ])
  // [...]
->columns([
  Tables\Columns\TextColumn::make('start')
    ->date()
    ->label('Start date (UTC)')
    ->icon('heroicon-o-calendar')
    ->sortable(query: function (Builder $query, string $direction) {
        $query->orderBy('start', $direction);
    }),
  Tables\Columns\TextColumn::make('start_time')
    ->label('Start time (UTC)')
    ->getStateUsing(fn (Model $record) => $record->start)
    ->icon('heroicon-o-arrow-left-on-rectangle')
  
    ->time()
    ->sortable(query: function (Builder $query, string $direction) {
        $query->orderByRaw('TIME(start) '.$direction);
    }),
  Tables\Columns\TextColumn::make('end')
    ->label('End time (UTC)')
    ->icon('heroicon-o-arrow-right-on-rectangle')
    ->time()
    ->sortable(query: function (Builder $query, string $direction) {
        $query->orderByRaw('TIME(end) '.$direction);
    }),
  Tables\Columns\TextColumn::make('duration')
      ->state(fn (Model $record) => CarbonInterval::seconds($record->duration)->cascade()->format('%H:%I:%S'))
      ->sortable()
      ->icon('heroicon-o-clock')
      ->summarize(
          Tables\Columns\Summarizers\Summarizer::make()->using(function ($query): string {
              return DateService::fromSecondsToHours($query->sum('duration'));
          })
      ),
  )];