Kjell is one of the official developers (I am not 
) which confirms what I suspected which is the fault is in the build system, not your code. They had to build a completely new build system over the past year as the one used for the 0.9.3b release in 2016 apparently no longer exists. The 0.9.4 release is a handful of pull requests made since 2016 and mostly a test of the new build system to make sure it all works. It looks like a change has been made that broke parts submit (it used to work correctly), so yes waiting a bit for the fault to get fixed and then submitting via github is the correct response. For a number of years now, pars submitted here in the forums were not being moved in to core parts (as it says somewhere in here will happen.) The only way parts make it in to core parts is via submission on github. Hopefully as we get development started again, that will change but for now github submission is it.
Peter