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I'm migrating from JDK1.7/Geoserver2.8.3 to OpenJDK11/GeoServer2.15.0, and have issues with ImageMosiac layers. No matter how I configure it, take from old Geoserver, upload by interface or configure by REST, it always show blank spaces where one tranaparency overlaps on other tiff's values. When I enable jaiext (shouldn't it be enabled by default according to documentation?) nothing helps, it is even worse, some grey boxes show up (they change depending on zoom level...).

Tried dozens of combinations of parameters, clean install, with enabled or disabled JAIEXT, sisabled BandSelect operation, etc, and nothing seems to work.

Clean install of Geoserver 2.8.3 with Java 7 shows it ok (attached).

UPDATE: Installed several versions of Geoserver 2.11.x - 2.15.x, it turns out that the presentation of my ImageMosaic changed from 2.13.2 (works fine) to 2.13.3 (shows transparent spaces). Both 2.13.2 and 2.13.3 installed in same environment - Oracle JAVA 8.

Any ideas?

Attaching some results and sample files (EPSG:2178):

https://filebin.net/m9l299g8mndmmcvz

geoserver 2.8.3-2.13.2 clean install shows ok: geoserver 2.8.3 clean install shows ok

geoserver 2.13.3-2.15.0 jaiext disabled preview - blank spaces geoserver 2.15 jaiext disabled preview - blank spaces

same as above but on map same as above but on map

geoserver 2.13.3-2.15 jaiext enabled preview geoserver 2.15 jaiext enabled preview

geoserver 2.13.3-2.15 jaiext enabled, other zoom level preview geoserver 2.15 jaiext enabled, other zoom level preview

geoserver 2.13.3-2.15 jaiext enabled on map geoserver 2.15 jaiext enabled on map

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