MCS it is good that you noticed and raised this issue. To the untrained eye it could have been a major problem.
However, rest assured as the a/c was at BMI's base - MAN. Engineers would have more than likely been present for the turnaround, the pilots would have done their walk around, and the many ground crew working around the a/c would have noticed it.
Then finally the ground crew would report on pushback any possible defects before being allowed off stand.