Unexpected behavior on intercompany eliminations on Disposals in a staged Entity's hierarchy

Summary:
I have two hierarchies with the same base members: one flat another staged. In the flat hierarchy, the disposal of entity RU83 is treated correctly by the native rules in FCCS_Proportion. In the staged hierarchy don't.

Content (please ensure you mask any confidential information):

As you can see in the picture below the base member RU83 is correctly reversed in FCCS_Proportion/FCCS_Aquisition Disposals datasource. The elimination is correctly reversed in FCCS_Elimination/FCCS_AcquisitionDisposals. So the contribution total is correctly calculated at TCO.RU83 node level, to zero contribution.

You can see that the account 25130G in FCCS_Entity Consolidation at TCO entity is zero. The system i