Track assertion errror when using MINIPCHI2 on the composite particle

At runtime, a MINIPCHI2 functor applied to the composite particle triggers an assertion error:

stack/Rec/InstallArea/x86_64_v2-centos7-gcc11-dbg/include/SelKernel/Utilities.h:259: auto& Sel::Utils::get_track_from_particle_or_track(const T&) [with T = LHCb::Particle]: Assertion `track' failed.