In eZ Platform 3.0 beta4 the `\eZ\Publish\Core\Repository\Values\ContentType\ContentType::$fieldDefinitionsByIdentifier` is not longer available (https://github.com/ezsystems/ezpublish-kernel/pull/2839/files#diff-44fda21f8491726bee83781572e6e99bL60-L65) but it's unfortunatly referenced in ezplatform-matrix-fieldtype bundle in 

• src/bundle/Resources/views/themes/admin/matrix_fieldtype/content_fields.html.twig
• src/bundle/Resources/views/themes/standard/matrix_fieldtype/content_fields.html.twig

which cause the following error when trying to render the field value: 

Neither the property "fieldDefinitionsByIdentifier" nor one of the methods "fieldDefinitionsByIdentifier()", "getfieldDefinitionsByIdentifier()"/"isfieldDefinitionsByIdentifier()"/"hasfieldDefinitionsByIdentifier()" or "__call()" exist and have public access in class "eZ\Publish\Core\Repository\Values\ContentType\ContentType".

Steps to reproduce

Create and publish content with ezmatrix field type 

Expected behavior

Field is rendered

Actual behavior

Exception mentioned above is thrown