After updating Omeka to version 2.1.2 (from 1.2.) the “Reference tree” block of “Reference” module (V3.4.21) has a strange behavior, as it does not index all existing items (example in https://www.csarmento.uminho.pt/site/s/rgmr/page/n-mero ).
Before the update every branch had several items, but now, only a few of the branches have items (and not all the items it is supposed to show).
Is seems to us that it can manage about 31 item references per block. If the the number is higher only some (ramdom) items are indexed in the tree.
Does anyone have an idea idea of what might be causing this behaviour?