Data layer variables not filled

Hello everyone,

I have connected my Nop Commerce webshop with Google Analytics 4 with the GA4 plug-in. E-commerce data is enabled within this plugin. The problem is that in GA4, all conversion data is attributed to (not set). For example in the source/medium report. There is data in GA4 in the Model Comparison report.
It seems data layer variables are not filled when I check the data layer with a test conversion.

Can I solve this problem with activating the following plugin: Google Tag Manager by nopStation? Or do you maybe have another solution to this problem?

Hope you can help me.
Thanks, Rian