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Customized MadCap Flare file type disappears from project settings after closing and reopening Studio

The subject says it all - I made enhanced MadCap Flare filetype (because the built-in one is incomplete), but it keeps disappearing from the project settings when I

  • have the project in projects list, then close and reopen Studio and open the project from projects list
  • or remove the project from projects list and then open it again

I have created dozens of custom various filetypes before, but never seen such behavior with any of them :-O
My colleague sees exactly the same behavior.

What's going on?! What can I do to stop this?!

Zipped filetype here:

Custom_MadCap_Flare.zip