'GA4 does not recognize the ecommerce 'items' parameter

To collect e-commerce data, I created a Ga4 data layer with GTM.

value, shipping, tax and items. as below ('item' parameter is just test)

But my GA4 doesn't recognize the 'items' parameter ONLY. Look at the picture below

all of other parameters are doing well, but not 'items'

GA4 does not recognize the ecommerce 'items' parameter. I can't find a solution. Do you know why?

Sources

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