Can't seem to change the nodata value on image from custom created ImageCollection

[amine-aboufirass]

I realize this question has been asked before, but I have tried proposed solutions and they don't appear to work.

I am downloading WAPOR data and creating my own ImageCollection based on the last part of this tutorial.

WaPOR data uses the the nodata value 255.0 as a default.

I create and export one image from the image collection as follows:

array = geemap.ee_export_image(
    collection.first(), 
    filename="GeeDownloads/WAPOR/test.tif", 
    scale=200, 
    region=extent,
    unmask_value=255.0,
)

I also tried using variations on Image.updateMask and Image.unmask all to no avail. The output raster still contains the values 255 scattered throughout and the nodata value used is 0.0, which I don't want.

What am I doing wrong here? Thanks.