Attachments: extendedData is an Array in some Cases

[desperateCoder]

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Describe the bug We have a user experiencing a bug, where the server returns the extendedData of an attachment as an array instead of an object:

{
  "title": "Melanie Webseite",
  "description": "http://someDomain.ch",
  "stackId": 6,
  "type": "plain",
  "lastModified": 1583477447,
  "lastEditor": "timo",
  "createdAt": 1583441985,
  "labels": [],
  "assignedUsers": [],
  "attachments": [
    {
      "cardId": 162,
      "type": "deck_file",
      "data": "someDomain-Einladung-feriegeburtstagswuche.jpeg",
      "lastModified": 1583442122,
      "createdAt": 1583442122,
      "createdBy": "timo",
      "deletedAt": 0,
      "extendedData": [/*THIS_ONE*/],
      "id": 13
    }
  ],
  "attachmentCount": 1,
  "owner": {
    "primaryKey": "timo",
    "uid": "timo",
    "displayname": "Timo SomeSurname",
    "type": 0
  },
  "order": 999,
  "archived": false,
  "duedate": null,
  "deletedAt": 0,
  "commentsUnread": 0,
  "id": 162,
  "overdue": 0
}

To Reproduce Steps to reproduce the behavior:

1. Sync via Android App with unknown constellation (sorry for that!)

this happened after an NC upgrade from 18 to 19

Expected behavior extendedData always to be an object

Client details: (quite irrelevant -> REST!)

Server details

Operating system:

Web server:

Database:

PHP version:

Nextcloud version: (see Nextcloud admin page) upgraded 18 -> 19

Where did you install Nextcloud from:

Signing status:

Login as admin user into your Nextcloud and access
http://example.com/index.php/settings/integrity/failed
paste the results here.

List of activated apps:

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your Nextcloud installation folder

Nextcloud configuration:

If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your Nextcloud installation folder

or

Insert your config.php content here
Make sure to remove all sensitive content such as passwords. (e.g. database password, passwordsalt, secret, smtp password, …)

Are you using an external user-backend, if yes which one: LDAP/ActiveDirectory/Webdav/...

Logs

Nextcloud log (data/nextcloud.log)

Insert your Nextcloud log here

Browser log

Insert your browser log here, this could for example include:

a) The javascript console log
b) The network log
c) ...