<Its a new test for a single large flocking bird (in JAR-E amendment 12, a new paragraph (c) in JAR-E 800). While the base GE90 does not need to comply, the GE90-115B does, I believe.
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I believe you are referring to the "Large Bird test" which is an 8 lb bird or its equivalent in kgs.
The pass criteria is that the engine not burst its cases, catch fire or lose the ability to be safely shut down, There is no power run-on requirement and the test is generally ho-hum compare to a full blade out.
The early GE90 (along with its competitors) had to comply as a Special Condition and did have difficulty with this test by creating a greater resulting fan imbalance than the blade loss test.