First, to get test data, navigate to this Google Drive Folder: https://drive.google.com/drive/folders/1sPym3puQIViu-FoMPSon2ciLzscn8YQQ?usp=sharing

For both Geoserver v2.11.5 and v2.14.1:

1) Add the g02135_extent_raster_basemap.sld style to Geoserver
2) Download the mosaic_rendering_test/ directory and create an image mosaic data store from that directory.
3) Publish a layer from the store.
   a) Under the "Data" tab, change "Coverage Band Details" to have a null value of 255, a minRange of 0, and a maxRange of 255.
   b) Associate the 'g02135_extent_raster_basemap' style with the layer under the "Publishing" tab.
   c) Enable the TIME dimension under the "Dimensions" tab.
   d) Save the layer.
4) Make a wms request for a thumbnail and save the resulting image, substituting {BASE_URL} and {WORKSPACE}: 
https://{BASE_URL}/wms?service=WMS&version=1.1.0&request=GetMap&width=300&height=300&format=image%2Fpng&layers={WORKSPACE}:mosaic_rendering_test&bbox=-3850000,-5350000,3750000,5850000&srs=EPSG:3411&TIME=2010-01-01&styles={WORKSPACE}:g02135_extent_raster_basemap

After the tests have been completed, compare the two images with e.g., imagemagick's `compare`:

compare img1.png img2.png -compose src diff.png

See the attached reproduced_diff.png for what the result should look like.