Cant see hourglasses in trial final boss

I can't always see the hourglasses in the final boss of the trial of S. because they look the exact same as the border of the room.

(edit)
I want to clarify that I had 70% movement speed and that it was the fact that one of them spawned behind the border and I couldn't see it that was the issue. All it needs is a red silhouette for example.

GG

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