very good keyword not found by "suggest rules"

[recski]

For "WidmungUndZwechbestimmung", the suggest rules function returns patterns with low precision that have nothing to do with the label, but it doesn't find something like this:
(u_514 / gewidmet): Precision: 1.000, Recall: 0.127, Fscore: 0.226, True positives: 20, False positives: 0