Firtool creates empty .sv files when it is passed "-o=."

Any ideas on why this might be happening?

I’m getting empty .sv files when firtool is passed “-o=.”, whereas it works fine if I pass in “-o=test/”

$ firtool --version
LLVM (http://llvm.org/):
LLVM version 18.0.0git
Optimized build.
CIRCT firtool-1.53.0

Empty .sv files:

        circt.stage.FirtoolOption("-o=.")

Non-empty .sv files:

        circt.stage.FirtoolOption("-o=foobar/")

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