Since 6.2 we get following error: `Error: [] operator not supported for strings` if you try to set a class item to a block with the field `field_cb_media`
This is because of the changes in https://git.drupalcode.org/project/rocketship_core/-/commit/3c8d4a150f72...
Attach the class to an array instead of setting the class as a string.
Needs review
6.2
Code