@Shengxi Wu The bug pops up when you have your attributes set to "By Class."  Going into the Edit Texture dialog causes the Fill Type, Fill Color, and Pen Color attributes to reset to no longer be by class, reverting to the last manual values set in the attributes pane.  If feels like random colors if you draft with attributes set By Class, as I do 99% of the time.   I've attached a video of this in both Vectorworks 2019 and 2021, but this has been happening for as long as I can rememb
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