[Proj] Transformations with height data to bessel bring unrealistic results

[Mark Johnson]

In 2012 this was also meantioned here:
https://lists.osgeo.org/pipermail/postgis-users/2012-April/033278.html

There ED50 / UTM zone 30N, epsg:23030 was being used.

The dhhn92 values are based on Amsterdam as 0, so what happen there on
similar conditions? Drops down to -40 meters?

Mark
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