Open a AB doc. Add a text layer. Select superselect tool. Select the layer. Hit M. Click on an icon in Appearance panel to change the text color. Close the color picker. Click on ellipse icon in HUD.
The same error can be reproduced with changing other attributes or choosing character styles from CC Lib during the mode.
Similar errors will result when you try to manipulate the target layer with items in CC Lib such as applying layer styles or pasting smart objects. Such attempts should exit the vector mask mode gracefully.
Open a AB doc. Add a text layer. Select superselect tool. Select the layer. Hit M. Click on an icon in Appearance panel to change the text color. Close the color picker. Click on ellipse icon in HUD.
The same error can be reproduced with changing other attributes or choosing character styles from CC Lib during the mode.