We have the fix available in the latest release. Please update Illustrator using Adobe Creative Cloud application to the latest build for version Illustrator CC 22.1.
Please refer to our knowledge base FAQ – https://illustrator.uservoice.com/knowledgebase/articles/1844590 if you face difficulty in update.
Or get in touch with us at any of the other support channels – https://helpx.adobe.com/support.html
Ashutosh Chaturvedi | Sr. Quality Engineering Manager – Illustrator
Adobe. Make It an Experience.Amanda McGee commented
I find that it happens often when changing the size of the blob brush with the bracket keys.Amanda McGee supported this idea ·Amanda McGee commented
I'm getting the same temporary marks as well, an artifact after using the blob brush. I'm using a wacom cintiq on windows 10