[gdal-dev] Coordinate transform from coordinate reference systems with different datum error in GDAL3.0.0

[Changhai Chen]

Hello, I would like to ask:
When I use GDAL 2.3.3 with proj4_4.9.3, I can convert the coordinate from
EPSG:4326 to EPSG:4326+5773(egm96_15.gtx) correctly with elevation value.
But when I use GDAL 3.0.0 with proj4_6.1.0, the elevation value of
coordinate unchange (Proj.db and egm file are found). The problem occur
when I convert from WGS84 to Beijing54 too.

Function use:
              OGRCoordinateTransformation -> Transform()
Thanks.
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