Scenario:

1. Create a product type and add 3 attributes and enable them for variants.
2. Create a product and generate variants based on these 3 attributes
3. Edit this existing product type and remove Attribute C
   
4. Go to product (from p2) and enter variants.
5. On the variants list - column with Attribute C disappeared but variants created based on this attribute are still there (in variant name)
   
6. Enter variant details - attribute C is still displayed

1. Edit this variant - Attribute C field is not visible

Currently, it's inconsistent, a column with the attribute is removed, and in view mode, the attribute is displayed while in Edit it's not.
We need to find a common solution for the cases when the user will change/remove anything in the product type which is already used in products and variants.

We need also to check how this change can impact commerce and e.g. cart if this variant was added to the cart if this removed attribute is displayed in the storefront etc.

source: reported by mateusz.bieniek@ibexa.co working on Tyrolit issue; Mateusz prepared also a quick fix to unblock the variant edition.