Pathfora not respecting show-on rule when there is a question mark in it

[shindakun]

While trouble shooting an issue with a modal I've noticed that if I have a single show on rule

            "urlContains": [{
                "exclude": false,
                "match": "substring",
                "value": "?shownon"
            }]

the modal will fire even though it should not be able to.