Ever since the ooze path was first brought in, I wondered if this was by design, or just something never changed in the code.

If you cast grease, or similar spells on a target, and you lose your concentration, they will not yell and attack you.
Yet, you cast stoneshatter or any other similarly respective (pre-existing) spell, and they will attack as if the spell was a success.

An example of myself just doing it infact.

c grease traveler.
You lost your concentration.

No combat ensued.