Group 23 bug

While completing Challenge 3 in Group 23, I found that Syntorial does not display the wrong mix of oscillators as an error (when pressing the Hint button or when completing the task), ie they are not highlighted in red, but the task is scored for 2 stars.

UPD: Found the same problem in Group 23 bonus 3

P.S.
Yeah, I totally overlooked the fact that I had the wrong mix. You should have seen my face when I realized that, haha!

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