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This issue is not a bug, but a new assertion added by myself for the issue #18408. The idea is to not call a Python function with an exception set, because the exception may be cleared or replaced (ex: hasattr() clears the current exception if an attribute is not found).
I didn't see this specific issue because AIX is using a special locale setting. Its locale encoding is an alias of the ISO-8859-1 which is not known by PyUnicode_Decode().
I'm waiting for the buildbot to see if my changeset fixed the issue. If it does, I will also add a fast-path for the "iso8859-1" alias of the ISO-8859-1 codec in PyUnicode_Decode(). So the AIX buildbot will also use the C implementation of the codec.