The new concept of "objects" (dB version)

Has anybody been playing with the db version (link below)? I’m curious about the concept of object (which I assume is new, right?).

From what I understood, an object is an entity in a class. Cool. However, when I set a property’s schema as “object” , it doesn’t seem to allow picking my existing objects (they never show as available in the picker).

Also (and possibly related), it seems Logseq treats differently objects created directly within the “class page”, from the ones created by tagging a block with the class. Or am I missing something?