I'm seeing blank parts along either the top and/or left sides when requesting an image with some bounding boxes and sizes. The layer is a time-enabled imagemosaic, which is in EPSG:4326, and covers the globe at a resolution of 1/8th degree resolution. Increasing the requested area slightly makes the area which was blank filled in.
Here's a WMS call which exhibits the problem: http://localhost:8080/geoserver/wms?service=WMS&request=GetMap&format=application/openlayers&version=1.3.0&layers=stormgeo:Significant_Wave_Height&styles=wave_ht_meters_sig&transparent=true&crs=EPSG:3857&bbox=697492.508703977,9597913.35523451,817665.800051298,9687546.93524809&width=1271&height=948&time=2021-04-30T12:00:00.000Z I can provide the sld and a geotiff used for this if someone wants to delve into this. I'm running geoserver 2.16.2 with tomcat8 on Ubuntu 16.04, using JAI:EXT for all operations except Lookup because of the known issue with that one, which causes a similar but worse version of this problem. I also tried running geoserver 2.18 back in January, but time-enabled imagemosaic layers did not work well at all in that version.
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