Tips, ??
leading edges or trailing edges??
Post a photo and all will be revealed
Most likely ice shed off a centerbody, but photos would confirm elimination of inlet or other fan blades them selves.
It's all in the vectors of a free body being ejected tangentially in an airstream vs one that is "sucked" in.
All engines would be threatened the same way at the same conditions so it should not be taken lightly.