GetImageProjection return nothing if used with Export/ImportImage

Description

After creating an application using an OTB image from ExportImage as input, the function GetImageProjection() returns an empty string.

In the following code, replacing Execute() by ExecuteAndWriteOutput() wrotes a tif with the correct projection (gdalinfo and qgis seem good)

If SetParameterStringList with path to .tif image is used, GetImageProjection returns the correct projection.

Steps to reproduce

def do_bandmath(image_name):
    bandmath = otb.Registry.CreateApplicationWithoutLogger("BandMath")
    bandmath.SetParameterStringList("il", [image_name])
    bandmath.SetParameterString("exp", "im1b1")
    bandmath.SetParameterString("out", "fake_out.tif")
    bandmath.Execute()
    otb_im = bandmath.ExportImage("out")
    return otb_im, bandmath

otb_image2, dep = do_bandmath("InputImage.tif")
bandmath = otb.Registry.CreateApplication("BandMath")
bandmath.ImportImage("il", otb_image2)
bandmath.SetParameterString("exp", "im1b1+1")
bandmath.SetParameterString("out", "out_image.tif")
bandmath.Execute()
proj = bandmath.GetImageProjection("out")
print(proj) # print empty string
# same behaviour with
# proj = bandmath.GetImageProjection("il")

Configuration information

Linux Ubuntu 20.04, OTB 8.0 , compiled using conda (superbuild)