Looks like there is a bug in latest RF's Jenkins plugin. In Robot Result if you drill down to an individual test case, it is shown as "Failed!" even the test case is passed. Interestingly Pass/Fail trend chart on the same page shows it as Passed. Also at "Robot Test Summary" and "All test suites" table, test case is counted as passed.

The issue looks like only if you drill down to individual test case result page.