The documentation stated that OTB 7.0 is not compatible with QGIS 3.12 and below, this is not true: it is OTB 7.1 that has compatibility issues.
The problem comes from the fact that GDAL 3.0 is used, and thus the PROJ_LIB environment variable should be set. This should be done by the plugin and will be fixed in QGIS 3.14.
Copyright
The copyright owner is CNES and has signed the ORFEO ToolBox Contributor License Agreement.
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Optionally, run git diff develop... -U0 --no-color | clang-format-diff.py -p1 -i on latest changes and commit
