Stretching does not seem to consider nodata in output properly

[aaime]

Use case, imagery with nodata set to 0, being stretched to 0/255, the output does not look at all like it should.

Expected output (obtained with normal JAI):

Actual output with jai-ext:

Style:

<?xml version="1.0" encoding="UTF-8"?>
<sld:StyledLayerDescriptor xmlns="http://www.opengis.net/sld" xmlns:sld="http://www.opengis.net/sld" xmlns:ogc="http://www.opengis.net/ogc" xmlns:gml="http://www.opengis.net/gml" version="1.0.0">
  <sld:UserLayer>
    <sld:LayerFeatureConstraints>
      <sld:FeatureTypeConstraint/>
    </sld:LayerFeatureConstraints>
    <sld:UserStyle>
      <sld:Title/>
      <sld:FeatureTypeStyle>
        <sld:Name>Sentinel2 TCI_105</sld:Name>
        <sld:FeatureTypeName>Feature</sld:FeatureTypeName>
        <sld:Rule>
          <sld:RasterSymbolizer>
            <ChannelSelection>
              <RedChannel>
                <SourceChannelName>3</SourceChannelName>
                <ContrastEnhancement>
                  <Normalize>
                    <VendorOption name="algorithm">StretchToMinimumMaximum</VendorOption>
                    <VendorOption name="minValue">0</VendorOption>
                    <VendorOption name="maxValue">105</VendorOption>
                  </Normalize>
                </ContrastEnhancement>
              </RedChannel>
              <GreenChannel>
                <SourceChannelName>2</SourceChannelName>
                <ContrastEnhancement>
                  <Normalize>
                    <VendorOption name="algorithm">StretchToMinimumMaximum</VendorOption>
                    <VendorOption name="minValue">0</VendorOption>
                    <VendorOption name="maxValue">105</VendorOption>
                  </Normalize>
                </ContrastEnhancement>
              </GreenChannel>
              <BlueChannel>
                <SourceChannelName>1</SourceChannelName>
                <ContrastEnhancement>
                  <Normalize>
                    <VendorOption name="algorithm">StretchToMinimumMaximum</VendorOption>
                    <VendorOption name="minValue">0</VendorOption>
                    <VendorOption name="maxValue">105</VendorOption>
                  </Normalize>
                </ContrastEnhancement>
              </BlueChannel>
            </ChannelSelection>
          </sld:RasterSymbolizer>
        </sld:Rule>
      </sld:FeatureTypeStyle>
    </sld:UserStyle>
  </sld:UserLayer>
</sld:StyledLayerDescriptor>

Test data available on request (see also internal ticket 12663)