MemoryRepo does not show refs

[yosess]

I am working in a project where I have to simulate a local git instance and being able to push files to remote repositories in Azure, GitLab, BitBucket.

Working in OSX, Python 3.8 and installed dulwich=0.2.50. I have been trying to replicate this example: https://github.com/jelmer/dulwich/blob/master/examples/memoryrepo.py
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local_repo = MemoryRepo()
local_repo.refs.set_symbolic_ref(b'HEAD', b'refs/heads/master')
print(local_repo.refs.as_dict())

porcelain.fetch(local_repo, sys.argv[1])
local_repo['refs/heads/master'] = local_repo['refs/remotes/origin/master']
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Issues:
set_symbolic_ref() seems not having effect, since printing refs in next line returns {}, if I try to print refs after FETCH, it is empty yet (fetch is returning remote refs if I print it). Last line here is giving a KeyError since no refs in local repo, similar lines in this example is failing for same reason.

b'HEAD' does not exist in local repo.

[jelmer]

This was fixed in 94cb156