Event Details->Assets->: Asset size is always 0

Steps to reproduce:
1. Go to Recordings->Events
2. Open the Event details of an archived Event and navigatie to Assets->Attachment->Attachment Details

This problem has been seen at the following places:

• Recordings->Events->Event Details->Assets->Attachments->Attachment Details

• Recordings->Events->Event Details->Assets->Catalogs->Catalog Details

• Recordings->Events->Event Details->Assets->Media->Media Details

• Recordings->Events->Event Details->Assets->Publications->Publication Details

Actual Results:
For all attachments I've ever seen, the size is always displayed as zero (although the files are non-zero bytes large).

Expected Results:
Either don't show the attachment size or show the correct value

Workaround (if any):