I just found a very easy workaround for this issue.
Create a "Unit manipulates inventory" trigger and change it to "Any Unit loses Any Item". Then you can just call a "Remove Unit" action on the "Triggering inventory item" and it is gone. Note that this even works if the unit drops loot. The inventory items are destroyed but the loot is dropped correctly. Of course, you can modify the trigger to only destroy particular items or for particular units.
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Go to your trigger editor and add a "UI - Show/Hide UI Frame" action. Choose "Supply Frame" as the argument and you're set.
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I just found a very easy workaround for this issue.
Create a "Unit manipulates inventory" trigger and change it to "Any Unit loses Any Item". Then you can just call a "Remove Unit" action on the "Triggering inventory item" and it is gone. Note that this even works if the unit drops loot. The inventory items are destroyed but the loot is dropped correctly. Of course, you can modify the trigger to only destroy particular items or for particular units.