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+towgs84=0,0,0 ignored in pipelines #881
With proj master
whereas the equivalent cs2cs gives 440719.958709357 3751294.2109841 -4.44340920541435
If you slightly modify the towgs84 values to be almost 0 like
you get the expected result. This strong discontinuity in outputs regarding very slight input parameter changes is not expected from my point of view.
The reason is that the completely 0 towgs84 is ignored in cs2cs_emulation_setup(), and so no cartesian/geodetic transformations are done to change the ellipsoids.
Suggested fix to come in a pull request