It is a Cython bug.
Most simple example:
sage: %%cython
....: def get(obj, int i):
....: return obj[i]
sage: class D(dict): pass
sage: d = D([(-1, "hello")]); d
{-1: 'hello'}
sage: get(d, -1)
...
KeyError: 0
sage: d[-1]
'hello'
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