puzzling pkl

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Hi Kamil,
first of all. thank you for the package!

I got a problem with an attached pickle, it would be great if is solved.
I am trying to read tracer (https://github.com/Teichlab/tracer) output.
The file is attached. I get the following:
Error decoding : Unknown opcode 98 (b) at position 455: 'b'

Go version 1.9.* and the result is the same in Win64 and in openSUSE.

Actually, it is a strange pickle,
I cannot read it from a python script anywhere outside tracer's docker container.
The python3 inside the container reads it with usual
fname='test.pkl'
with open(fname,"rb") as f:
data=pickle.load(f)

test.zip

Thank you!
Cheers,
Sasha.