FullAcAutomaton fails depending of the order of the patterns

[calixteman]

let aut = AcAutomaton::new(vec!["libcore/", "libstd/"]);
let aut = FullAcAutomaton::new(aut);
let matches: Vec<_> = aut.find_overlapping("libcore/char/methods.rs").collect();
assert_eq!(matches, vec![Match {pati: 0, start: 0, end: 8}]);

let aut = AcAutomaton::new(vec!["libstd/", "libcore/"]);
let aut = FullAcAutomaton::new(aut);
let matches: Vec<_> = aut.find_overlapping("libcore/char/methods.rs").collect();
assert_eq!(matches, vec![Match {pati: 1, start: 0, end: 8}]);

The second assertion is failing.
If I comment the lines let aut = FullAcAutomaton::new(aut);, everything is ok.
This bug is a followup on:
BurntSushi/ripgrep#1079