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I used 'bean browse action' from apisupport to see details of filesystem root and when I expanded original of this filter node and go deeper to its properties an exception was thrown.
Created attachment 9373 [details] NPE stacktrace
The last trace from NB is from nodes. Assigning to openide/nodes to evaluate.
Taking over the node bugs from phrebejk.
Dup of already fixed issue 32544 *** This issue has been marked as a duplicate of 32544 ***
verified duplicate by the way it is fixed for incoming release NB 3.6