After Upgrade to 12.0 Task List empty but still shows on Client Devices

[bstin]

Steps to reproduce

1. Upgrade to 12.0
2. Look at Web interface and see that Task List is emtpy
3. On client devices (Evolution Linux Desktop / Reminders iOS) see task are still present

Expected behaviour

Should show task on Web Interface

Actual behaviour

Blank

Server configuration

Operating system: Debian 9

Web server: Apache2

Database: MySQL

PHP version: 7.2

Nextcloud version: (see Nextcloud admin page) 12.0.1

Tasks version: (see Nextcloud apps page) 12.0

[bstin]

Addendum:

If I add a "New List" on Web Interface it will appear on Client devices, but as soon as I add a task from Client Device (ie. Evolution), the list disappears from Web Interface but continues to show on Client Devices.

[bstin]

Addendum:

It also seems to have deleted ALL my calendars?

Is there a way to downgrade. Suddenly no Calendars are showing up on any device?

How is this possible?

[raimund-schluessler]

Duplicate of #908, PR is in #911, will be released with 0.12.1 soon.

Your calendars were not deleted by the Tasks app for sure. It is just a client and #908 prevented the app from loading correctly. It didn't lead to a deletion of data.

[raimund-schluessler]

I suppose everything works again with v0.12.1?

[pweiden]

From my point of view, everything is working again with 0.12.1 as it was with 0.11.3. Thanks for the quick fix!