Share read only calendar: only the users calendars are shown

[r00tr4v3n]

I'm trying to setup two users (and more) with shared work/projects calendars and a private one.
When accessing the work calendar from user2 with user1, I get all calendars from user 1 again. Thus, I get the same calendars from user1 twice. I can download the work calendar from user2 via browser.
This URL gets me the calendars from user1 instead of 2 when connected with user1 credentials: https://domain.com/user2/work/
Any idea why?

[root]
user: .+
collection:
permissions: rR

[share_alice_work]
user: bob
collection: alice/work
permissions: r


# Allow reading and writing principal collection (same as username)
[principal]
user: .+
collection: {user}
permissions: RW

# Allow reading and writing calendars and address books that are direct
# children of the principal collection
[calendars]
user: .+
#user: {user}
collection: {user}/[^/]+
permissions: rw

[share_family]
user: alice
collection: bob/family
permissions: rw


[share_robot]
user: robot
collection: bob/projects
permissions: rw

[pbiering]

Can you paste the related directory structure of the collections and their symlinks like shown in Wiki
https://github.com/Kozea/Radicale/wiki/Sharing-Collections