shebang changed to /usr/libexec/platform-python when building python rpm packages

I am trying to build a RPM from a python application on RHEL8.2 machine. the shebang on the scripts are set correctly to #!/usr/bin/python3 however for some reason the shebang gets changed to #!/usr/libexec/platform-python -s when the RPM is built. I have tried almost everything. I have undefined the mangling according to doc: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/packaging_and_distributing_software/advanced-topics %undefine __brp_mangle_shebangs but the shebangs gets still changed. this is the relevant parts of the specs file: %undefine __brp_mangle_shebangs Name: myapp Version: 2.0.0 Release: 1%{?dist} summary: rpm for my APP BuildArch: noarch ### Build Dependencies ### BuildRequires: python3-setuptools BuildRequires: python3-devel %?python_enable_dependency_generator %build %py3_build %install %py3_install %files .... I can include python*-rpm-macros to the specs and that would set the shebang to something like /usr/bin/python3.6 but it is too restrictive. Our code works in anything > python3.6 so if we deploy the rpm in a system with python3.8 it should work. how can I set /usr/bin/python3 or leave the shebang unchanged on the python scripts? when the rpm is packaged?