The saveToDedicatedTables() in SqlContentEntityStorage.php is not working properly with MapItem field.

Problem/Motivation

On the saveToDedicatedTables() in the SqlContentEntityStorage.php is not working properly with mapitem fields, the following code:

 foreach ($storage_definition
            ->getColumns() as $column => $attributes) {
            $column_name = $table_mapping
              ->getFieldColumnName($storage_definition, $column);

            // Serialize the value if specified in the column schema.
            $value = $item->{$column};
            if (!empty($attributes['serialize'])) {
              $value = serialize($value);
            }
            $record[$column_name] = SqlContentEntityStorageSchema::castValue($attributes, $value);
          }

At the $value = $item->{$column}; is trying to get $item->value that does not exist in this item(the correct in my analysis would be $item->values)

Steps to reproduce

Programatically insert an array in a MapField, try to save the entity that has the field data.

Proposed resolution

I changed the code to:

            if(!isset($item->$column)){
              $value = $item->getValue();
            }
            else{
              $value = $item->$column;
            }

But its a invasive solution that changes the drupal core, and i want to discuss with you guys if this is really an issue and if this change is safe to do.

Remaining tasks

Discuss the problem and check if this is a core issue or it's a mistake from my part.
discuss if the proposed solution is ok.