CardDAV REPORT /{addressbook} UID malformed

[kurbar]

Steps to reproduce

1. Enable Contacts
2. Create a contact via Owncloud web interface in your addressbook
3. Try to download all contacts from the given addressbook via CardDAV REPORT

Expected behaviour

I'm able to download correct VCARD objects.

Actual behaviour

UID field in VCARD object is malformed

REPORT /remote.php/carddav/addressbooks/admin/contacts/5e478a41-c819-476a-b383-e15fa7b68482.vcf
...
BEGIN:VCARD
VERSION:3.0
FN:Ivan Smetchejov
UI5e478a41-c819-476a-b383-e15fa7b68482
TEL;TYPE=HOME,VOICE:56123123
REV:20181207T131456Z
ENVCARD

Server configuration

Operating system: Docker

Web server: Docker

Database: Mysql

PHP version: 7.2

ownCloud version: 10.0.10.4

Updated from an older ownCloud or fresh install: fresh install

Where did you install ownCloud from: DockerHub

Signing status (ownCloud 9.0 and above):

Login as admin user into your ownCloud and access 
http://example.com/index.php/settings/integrity/failed 
paste the results into https://gist.github.com/ and puth the link here.

https://gist.github.com/kurbar/32d21ecc714bc1313c0b471bebf1480a

The content of config/config.php:
https://gist.github.com/kurbar/da7bcaf31c8b3402b334efe9738cc3df

Are you using external storage, if yes which one: no
Are you using encryption: no

Are you using an external user-backend, if yes which one: no

[Julian1998]

Are there any logs in the browser console?

[kurbar]

@Julian1998 No browser logs. The VCard object is from the raw xml response through Postman. Also no errors from server side, only 207 response logs.