magento2 migration tool – Custom product attribute settings gets overwritten trying to migrate only orders/customers

I am doing dry runs before final migration from Magento 1.9.2.4 to 2.4.2.
I have configured the migration tool so that I don’t import products, only customer data and orders.
But my problem is that after I run the migration all my changes to custom attributes gets reset. The products are left untouched, but the attribute settings (most importantly my custom dropdown attributes) are overwritten or removed.

So i.e. if my M1 products had Manufacturer attribute like this:

45 – Lada

46 – Volkswagen

And I change this in M2 to

45 – Maserati

46 – Ferrari

This works fine until migrating orders and customer data again, and I’m stuck with Lada and Volkswagen 🙁
Is there something I can ignore somewhere in the migration XMLs to keep my Maseratis and Ferraris?