Since 3.1.8 creating new contacts doesn't save properly

[DBJRdev]

Describe the bug

Creating a new contact does not work properly anymore. A spinner indicates the non-saved state. At a certain point the new contact is saved, but often data is lost.

To Reproduce
Steps to reproduce the behavior:

1. Create new contact, insert name of contact and start typing a phone number
2. Spinner keeps turning
3. Continue with other fields
4. Sometimes the contact seems saved, sometimes not

In the console you an see an "Error: dist.js:1:56302" is triggered.

Expected behavior
Creating new contact should make sure it's actually saved

Actual behavior
Sometimes saved, sometimes not.

Server configuration

Operating system: Debian

Web server: Apache

Database: MySQL 5.7

PHP version: 7.3

Nextcloud version: 17.0.3, but was there on 17.0.2 as well

Contacts version: 3.1.8
It did not appear, to our knowledge, with version 3.1.6

Updated from an older Nextcloud or fresh install:
basic install was 17.0.0

Client configuration

Browser: Firefox on Ubuntu 19.10

CardDAV-clients:
Nextcloud web ui

Logs

Browser log

This contact did not have a proper uid. Setting a new one for
Object { jCal: (3) […], addressbook: {…}, vCard: {…}, conflict: false }
contact.js:72:11
XHRPUThttps://DOMAIN.de/remote.php/dav/addressbooks/users/USER/kontakte/BBAE65B8-3DAB-4177-8786-7C7DC3A29F9C.vcf
[HTTP/2 201 Created 182ms]

XHRPROPFINDhttps://DOMAIN.de/remote.php/dav/addressbooks/users/USER/kontakte/BBAE65B8-3DAB-4177-8786-7C7DC3A29F9C.vcf
[HTTP/2 207 Multi-Status 63ms]

XHRPUThttps://DOMAIN.de/remote.php/dav/addressbooks/users/USER/kontakte/D19B3B02-042F-4DDE-B9A9-BCE7D31C2A19.vcf
[HTTP/2 400 Bad Request 86ms]

Error: dist.js:1:56302
XHRGEThttps://DOMAIN.de/ocs/v2.php/apps/notifications/api/v2/notifications
[HTTP/2 200 OK 93ms]

[pawlosck]

I have the same problem. When I want to fill "New contact" (contact name) field as first, contact is not saved. Contact is creted but fields are empty. I am using similar configuration.
Ubuntu 19.10 (client and server), nextcloud 18.0, contact app 3.1.8, firefox for ubuntu

[skerbis]

Same here in Nextcloud 17 and 18
both versions fresh installed

[tdoerschel]

Hi, it seems to be a duplicate to #1453
I added my info there

[DBJRdev]

Closed, because it's solved (see discussion at #1453 and following new release).