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A multisection line is a group of branches in series representing a breaker-to-breaker link of branches. Branches internal to the multisection line cannot be opened in practice, instead the whole breaker-to-breaker link will have to be opened during maintenance or any other kind of event. The character '&' is reserve for the id of these multisection lines. member branches are define in the branch section with standard id characters.

It seems ACCC recognize that an internal branch is called to be outage therefore 'reverts' to outage its corresponding multisection line. Being a grouping of lines, you can delete such entry from the multisection table, without changing the true network topology, allowing member branches to be evaluated in explicit contingency definitons. I do not think this feature is a bug.