macOS slab pre-processor not working

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I am running energyplus on macOS and usually this works fine (enough). My typical workflow is that I copy the required binaries into a temporary folder along with a in.idf file. In the past I had issues when I forgot to copy one of the library files along, such as libgcc_s.1.dylib. Now I wanted update from energyplus 9.2.0 to 9.6.0 and I am not able to resolve this issue. When I try to run the Slab pre-processor as a dry-run, even from within the installation path, I get this issue:

/Applications/EnergyPlus-9-6-0/PreProcess/GrndTempCalc/Slab
dyld: Library not loaded: /usr/local/opt/gcc@9/lib/gcc/9/libgfortran.5.dylib
  Referenced from: /Applications/EnergyPlus-9-6-0/PreProcess/GrndTempCalc/Slab
  Reason: image not found
[1]    53934 abort      /Applications/EnergyPlus-9-6-0/PreProcess/GrndTempCalc/Slab

All other files, such as /Applications/EnergyPlus-9-6-0/PreProcess/GrndTempCalc/Basement or /Applications/EnergyPlus-9-6-0/energyplus run just fine.

• Any ideas what else I could try?
• Can anyone confirm if they get the same issue on macOS?
• Is this a potential bug and should I open an issue on Github?