CensoredUsername added the comment:
Indeed. In my case the problem was caused a subclassed Pickler which still used
GLOBAL instead of STACK_GLOBAL in protocol 4.
My own minimized test case was:
data = b"\x80\x04\x95\x11\x00\x00\x00\x00\x00\x00\x00cpickle\nPickler\n."
>>> pickletools.dis(data)
0: \x80 PROTO 4
2: \x95 FRAME 17
11: c GLOBAL 'pickle Pickler'
27: . STOP
highest protocol among opcodes = 4
which should return pickle.Pickler
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<http://bugs.python.org/issue23094>
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