Inconsistency on sharing Items with multiple collections

Hi Bitwarden-Forum,

The goal: Sharing an existing item with another Collection.

Screens:

1. case

I’m in my Vault, clicking the gear icon next to the item “Allianz” → Collections
Screen 1

I see the collection the item “Allianz” is in. Furthermore, I could select other collections, no problem here.
Screen 2

2. case

I’m in the Organization’s Vault, clicking the gear icon next to the item “Allianz” → Collections
Screen 3

I get this error. It’s the same item “Allianz” that worked before.
Screen 4

I’m logged in with my user that has these permissions.
Screen 5

Is this an error of Bitwarden, or am I missing something?

Best

Till