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I am encountering the same issue with a black image. My source DEM is ArcticDEM, which is Float32. Applying ContrastEnhancement in the style did not help, but I was able to convert to Int16 using GDAL and the resulting image works in GeoServer 2.15.1 (JDK 11.0.2).
$ gdal_translate -a_srs EPSG:4326 -a_nodata -9999.0 -ot Int16 -of GTiff -co COMPRESS=DEFLATE -...
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