Using FME2019.1 I get some unexpected behaviour of SpatialRelator3.
Instead of 'merging' values from SpatialRelator & SpatialRelator_2, FME seems to copy attribute values from one attribute to another. (see screenshot).
'grafnummer' & 'bloknummer' should have different attribute values but FME seems to 'copy' values for both attributes. This behaviour does not occur when running the workspace in 2018.