Shared calendar is not editable despite checked "can edit" checkbox

[chkl]

Hi
since I couldn't find this bug (or feature?) originally described here I'm opening this.

Steps to reproduce

1. Create a calendar
2. Share to user X (not a group) with checked "can edit" box
3. Log in as that user

Expected behaviour

The calendar should be editable by user X

Actual behaviour

It appears under "Subscriptions" and is not editable.

Server configuration

Operating system: Debian 9

Web server: Apache

Database: Postgresl

PHP version: 7

Nextcloud version: (12.0.3)

[svenXY]

confirmed here.

[georgehrke]

dup of nextcloud/calendar#606