Calligraphic Brush, Blob Brush appearance anomalies at small brush sizes (1 pt and above)
Illustrator 22.1, though this is extant in all versions I'm familiar with (since at least CS5).
When drawing with a calligraphic brush (and thus also with the blob brush) at small sizes, certain tight curves result in anomalous shapes extending out from the expected area covered by the brush. The screenshot attached is around 15mm across. AI file also attached. Expected result is that the brushed area corresponds to the shape of the calligraphic brush along the whole length of the path.

I am happy to share that we have fixed this bug in our latest release – 23.0.6 which is available worldwide now.
Going forward, our goal is to fix as many top User-Voice bugs as possible and as frequently as possible. Given the nature of the fixes, some of the bugs will take a longer time to fix, but we are on it.
You can update to the latest release using Creative Cloud desktop App: https://helpx.adobe.com/in/creative-cloud/help/creative-cloud-updates.html
Thank you for all the feedback. Keep it coming!
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Doug Roberts commented
Still present in 27.5
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Doug Roberts commented
Still present in 26.4.1
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Tom Wilson commented
Still in 26.2.1 Please fix!
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Doug Roberts commented
Still in 26.0.2
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Neg Koray commented
Still an issue as of OCTOBER 2021!
Jesus Christ. -
Doug Roberts commented
And still in 25.3.1:
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Anonymous commented
This bug hasn't being fixed but Adobe is looking at the other side.
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Simon Bowland commented
This bug hasn't been fully fixed and therefore should not be showing as "completed".
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Doug Roberts commented
And still in 24.0.0
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Doug Roberts commented
I'm still seeing the bug in the 23.1 release.
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kim in commented
When is that getting finally fixed ??? Admin ?? Newest release didn't solve the problem.
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Eric commented
Could we get an official response, because the problem is still present.
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Jessie Chang commented
what's wrong with the ai? it is ok when i save to jpg, but is shows different way in programing......
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Doug Roberts commented
Hi Ashutosh,
I can recreate the problem in your own file by increasing the brush size from 5 to 6 pt:
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nk commented
and with slightly modified stroke we have results like shown in attached printscreens and it is NO good.
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here is the gif file demonstrating the difference between pre and post fix. Please notice the change in appearance pre and post the fix. I am switching from outline view to demonstrate that they have the same underlying path. You can download the file i used from my previous comment.
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Attaching the file that shows difference and the fix made.
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Eric commented
It's NOT fixed. Return the original title.
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Brittany commented
bug is not fixed 2019
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Nikola Knežević commented
Bug is still present in 23.0.6. Please bring back original title of post:
Calligraphic Brush, Blob Brush appearance anomalies at small sizes.It is not good idea to complete bug fix by adapting title.