I noticed that when creating a collection, this collection is gone after locking (or restarting) 1Password.
Not sure whether this is part of the "read-only" part of the current version, but the getting started page seems to imply that the collections feature should be working.
(And as a collection can cover vaults from different accounts, I also assumed this was a client-side thing, so not hindered by the read-only-ness of the 1P account data.)
1Password Version: snap 0.8.5
Extension Version: Not Provided
OS Version: Ubuntu 18.04
Sync Type: Not Provided