There are a few issues with the cmake modules that help finding connext libraries for QNX
I have noticed that the new package rmw_connextdds has new cmake files that also search for connext installation, rti_connext_dds_cmake_module/cmake/rti_build_helper.cmake and the module that comes with host package rti_connext_dds-6.0.1/resource/cmake/FindRTIConnextDDS.cmake
Issue 1: