Hello,

I’m currently experiencing issues when rendering coverages with bicubic 
interpolation on GeoTools 32.1.

When rendering my coverage, the API returns a null reference, which per 
documentation would state that the coverage does not intersect the area to be 
rendered. However, if I disable interpolation, the area is rendered fine albeit 
the result is ugly.

I created a fork of the main repo and was able to reproduce the issue in unit 
tests. A simple CRS transformation would solve my issue, see the modified unit 
test and a fix for the rendering issue in here: 
https://github.com/FluiditLtd/geotools/commit/9a8fd3ebdb4321957c7f7dc10d290e36b25f7d04

My question is: Is this a bug? If this is indeed a bug, I can create a PR from 
the fork if the fix is deemed adequate.

Best regards,

Topias Rusanen
Software Team Lead
Fluidit Oy
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