custom poller fails with Missing Filter configuration: required for table entry MIBs used in MIBexpression

NNMi 23.4 P2

custom poller fails with Missing Filter configuration: required for table entry MIBs used in MIBexpression

It's a very simple one using a predefined MIB-expression, here you see we want to monitor the line with the value of 27 and get the value 27 easy with 

a snmpwalk

This is the juniper mib-expression used in the custom poller:

The discovery statue as for all of the nodes failed, and the custom poller collection is not shown in the node details

The custom poller collection is correct, the policy is triggering the collection as well-but nothing happens.

We used the standard instance filter * and for testing as well FP* to no success, I assume

this freaky characters in the jnxOperatindDescripre row with @2/*/* are the cause for this issue, can anybody help?