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I think this is the default behavior of readline module.
the default word delimiters for completion contains dash(-). so completion breaks at dash.
 >>> import readline
 >>> readline.get_completer_delims()
 ' \t\n`~!@#$%^&*()-=+[{]}\\|;:\'",<>/?'
In contrast, the default word delimitors of GNU readline is "\t\n\"\\'`@$><=;|&{(" and perl binding does not change it.
when I remove dash from delims like below, it works.
 >>> readline.set_completer_delims(readline.get_completer_delims().replace('-', ''))
 >>> input()
 a-
 a-bc a-de
 a-