Saxon

This bug may be symptomless - I encountered it during development of Saxon 13 and I don't know if the relevant code is executed in previous releases.

XPathParser.makeNamespaceTest() contains the code:

        if (prefix.startsWith("Q{")) {
            String uri = prefix.substring(2, prefix.length() - 2);
            return new NamespaceTest(pool, nodeKind, NamespaceUri.of(uri));
        }

This truncates the last character of the URI. It should be prefix.length() - 1.