eZ Find didn't find an object If I use one policy with content/read and a limitation to a node AND a subtree (important is the "AND").
In eZ Publish I have the correct rights. eZ Find makes it wrong. If I use one policy for a limitation to a node and a subtree, my query is:

.....
( ( meta_main_node_id_si:43 OR meta_main_node_id_si:51 ) AND ( meta_path_si:210 OR meta_path_si:12588 OR meta_path_si:12596 )
....

That means that my search result must be node_id 43 or node_id 51 within subtree 210 or 12588 or 12596. But both nodes are not in these subtrees. That's why I found no object with one of these subtrees.

But in eZ Publish I can read objects in these subtree.

If I change this one policy into 2 policies, eZ Find can find objects in these subtrees. In this case one policy has content/read with limitation to nodes. Another policy has content/read with limitation to subtrees. Now my query is:

...
( ( meta_path_si:210 OR meta_path_si:12588 OR meta_path_si:12596 )) OR ( ( meta_main_node_id_si:43 OR meta_main_node_id_si:51 ))
...

Now both parts are joined with OR. That's correct. But