ArcGIS Raster to Float tool ends up with different coordinate system

I am exporting a raster within a geodatabase to a flt file using Raster to Float tool in ArcGIS 10.7

The raster had an XY coordinate system of GDA 1994 MGA Zone 56.

When I checked the coordinate system of the Float file, it’s GDA 1994 UTM Zone 56S.

Can someone explain why this is happening? I checked under "environment" to set the coordinate system to be "Same as Input" but this still happened.