While we are used to associate "the observer effect" with particle physics, it can appear in biology and/or chemistry as well.
Keeping things meticulously clean on the microscopic level is a complicated task. One of the many reasons why so few EUV chip fabs even exist.
By that same effect we probably introduced life on Mars already.
It’s not improbable that some micro organism might have escaped the safety protocols. The likelihood it is still alive is low