File attachment block: select vs drag-n-drop

I’m a bit confused that uploading a file into the attachment block seems to be different from using drag-and-drop-uploading. E.g. the title field is not populated when selecting the file from the server, whereas it is when I drag-and-drop the attachment.

There also seem to be differences in populating the placeholders which makes it neccessary to put some of the template code into a separate chunk in order to get it to work also with selected files.

Is that a bug or is it to be expected?