Attachments not listed in API

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Describe the bug
I try to get the attachments from a card, while attachmentCount is for example 3, list of attachments is empty.

To Reproduce
Steps to reproduce the behavior:

1. Create a card
2. Attach a file from nextcloud
3. Attachment is listed in browser
4. check API endpoint GET /boards/{boardId}/stacks/{stackId}/cards/{cardId} - attachmentCount is the count of attachments, attachments is an empty list
5. check API endpoint GET /boards/{boardId}/stacks/{stackId}/cards/{cardId}/attachments - empty list

Expected behavior
see a list of attachments or the fileId or a download-link

Screenshots
{'id': 1118, 'title': 'HP_Eindrücke', 'description': 'fancy description', 'stackId': 13, 'type': 'plain', 'lastModified': 1724497262, 'lastEditor': None, 'createdAt': 1724493549, 'labels': [], 'assignedUsers': [], 'attachments': [], 'attachmentCount': 3, 'owner': {'primaryKey': 'user', 'uid': 'user', 'displayname': 'user', 'type': 0}, 'order': 3, 'archived': False, 'done': None, 'duedate': None, 'deletedAt': 0, 'commentsUnread': 0, 'commentsCount': 0, 'ETag': '3c3400ac740ece4c0dae4eafb1125958', 'overdue': 0}

Nextcloud version: 29.0.4
Deck version: 1.13.1

Start by reproducing the issue with a card and an attached file, then compare GET /boards/{boardId}/stacks/{stackId}/cards/{cardId} with its /attachments endpoint. Trace why attachmentCount is nonzero while both attachment lists are empty. Done means the API returns the attachments, their fileId, or a download link consistently.