Caption in multilingual environment

Caption in multilingual environment is not working

Using drupal 9.5.7 with multiple languages and the standard image field 'field_image' and settings for using caption

I have multiple languages (e.g. english, german and 10 others). The image field have multiple values (e.g. two images) assigned.

I install the rich_image module and enable in the 'Rich Image Properties' the "Caption property'.

Then in the node edit form (Admin theme Seven) for english language we add captions to both images, save the node and go to the edit form in german language. Also add captions to the both images and save the node.

In the database in the table 'rich_image' I see the four values en, de for two images in the caption column.

I then open to to the node again and want to edit it in english. There no values are shown in the caption fields, although they exist in the database table. If I then save the node, without changing anything, the values in the caption column were deleted but the record already exists.

The same result, if I edit the node in german language.