Github user dkuppitz commented on the issue:
https://github.com/apache/tinkerpop/pull/486
Requirements were not cached in `tp31`. I have a neat solution for
`master/`, but not for `tp32`. In `tp32` we can either reset the requirements
after each strategy has been applied or we can ignore the caching, which - in
the worst case - would make the traversal assume, that it has more requirements
than it actually has. This is the only case I can currently think of:
When `IncidentToAdjacentStrategy` replaces `bothE().otherV()` with
`both()`, the traversal could lose its `PATH` requirement.
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