Incomplete Purchase journey and Checkout journey

It's likely not a module issue. If you can confirm that your dataLayer sends data in the console, it is likely a GA threshold, meaning your site doesn't produce enough data for GA. You can change this in GA in Settings>Data Collection and Modification>Data Collection by disabling
"Include Google signals in reporting identity."

Many thanks for Your response.
Google signals data collection wasn't activated yet (so there was no "Include Google signals in reporting identity" switch).
Now I've turned on Google signals data collection. I'll check it a few days later.

Add payment info and shipping are currently empty placeholders that are not implemented, so it's not surprising that nothing shows up there.

I'll likely have a look at that soon as we probably need this too.

I am working on the patch to support data for payment and shipping info.

I have just found out that the checkout process on the project is too custom to create universal patch :-(

(I'm marking this and another issue with a "Deprecate Commerce GTM" tag. These are issues that fill gaps for us to formally recommend closing that module and migrating sites to this one.)