SQL2 Like operator not working as expected

Assume I only have the following nodes in the repo that need to be found

/a/b/c/d/e
/a/b/c/d[2]/e

According to XPathToQUeryTranslaterTest (Lines 66 ff) the following queries should deliver the same result:

/jcr:root/a/b/c/d/e
returns 2 results

SELECT * FROM [nt:base] AS BASE WHERE PATH(BASE) LIKE '/a/b/c/d[%]/e[%]'
returns no result at all

SELECT * FROM [nt:base] AS BASE WHERE PATH(BASE) LIKE '/a/b/c/d[%]/e%'
returns only /a/b/c/d[2]/e

SELECT * FROM [nt:base] AS BASE WHERE PATH(BASE) LIKE '/a/b/c/d%/e%'
returns 2 results

So the brackets don't work as expected, but omiting them solves the problem. Is this the expected behaviour or a bug?