The new feature https://idempiere.atlassian.net/browse/IDEMPIERE-3338#icft=IDEMPIERE-3338 includes the docstatus dashboard gadget, but it does not support themes, like the other gadgets.

Attached you can find the fix to this problem.

ps. if you use custom themes you should also include the /theme/default/zul/dashboard/docstatus.zul in the dashboard folder of your custom theme